How Brain Retraining Is THE Missing Piece in Chronic Illness

For years, my body seemed to be reacting to everything. Sound. Food. Mold. The ordinary things other people moved through without thinking — noise that everyone else could shrug off went through me like an alarm. My brain felt underwater, and my life grew smaller as diagnosis after diagnosis arrived.

I did everything I was told to do. I treated the Lyme. I addressed the thyroid. I cleaned up my diet until I was down to three foods. And still, something was missing. It took me years to see what it was, and when I finally saw it, I understood why no doctor, no protocol, no cleanse had ever fully closed the door.

Because here is the truth nobody told me: while it was all those things — Lyme, heavy metal poisoning, chronic fatigue, thyroid illness — at its root, it was something entirely different. It was a limbic system injury. That is what no one told me. Not one doctor. Not one specialist. Not one protocol. The missing piece was not another treatment for my body. It was my brain — the ancient, alarm-running part of it — still firing the signal that the world was trying to kill me.

Brain retraining is THE missing piece in chronic illness. I will say it again, because I mean it: THE missing piece. The limbic system is the deep, old part of the brain where threat lives — where the fight-or-flight response is switched on and, crucially, where it is supposed to be switched off. When injury, toxins, and trauma lodge there, the switch sticks. The alarm never clears. And a body that believes it is dying will never get well, no matter what you treat.

Retrain the limbic system, and the switch lets go. That is what I mean by brain retraining. And it changes everything.

The truth is, I did DNRS — the Dynamic Neural Retraining System. That is where I first learned that the limbic system could be retrained, that the stuck alarm could be reset. It changed my understanding of my own illness, because for the first time someone was naming the thing every specialist had missed. I will always be grateful for that door. And once I was through it, I kept walking: I built the practice into my own life, in my own way, weaving the retraining together with the detoxing, the fasting, the frequencies, and the writing. The program opened the door. My healing was mine.

And don’t get me wrong — I still NEEDED to detox. I needed to chelate, to pull the metals out, to remove what was killing me. The Lyme needed treating. The body needed clearing. If I had only retrained my brain while the poison was still inside me, I would have calmed the alarm in a burning house. The detox and the retraining were not rivals. They were two halves of the same rescue: get the poison out, and tell the brain the war is over. Neither one alone would have saved me. Together, they did.

When your body is always on alert

My health collapse began after a tetanus shot. I came to understand what happened to me as heavy-metal poisoning, and I spent years trying to find my way through the aftermath.

The diagnoses stacked up: chronic Lyme, Hashimoto’s, celiac disease, high cholesterol, chronic fatigue syndrome, POTS, and mast cell activation. My body reacted to almost everything. At one point, I could eat only three foods.

I lived with brain fog for a decade. I couldn’t remember anything. I was hot and cold — burning up one hour, shivering the next — and POTS rendered me bedridden. My life shrank to the size of a bed. I know how disorienting it is to lose access to the mind you once relied on, to reach for a thought and find only blankness.

How could all these things be connected? That is the question I could not stop asking from that bed. When you are separated from everything you once understood — your work, your body, your own mind — you start looking for one answer that could hold it all. Every specialist had a piece. Nobody had the whole.

When I finally began looking at brain retraining, I started asking a different kind of question. What if my nervous system had learned to live in emergency mode — and had never been shown how to come out of it?

Think about what a decade of illness teaches a brain. Every sound becomes a threat. Every food becomes a suspect. Every symptom becomes a siren. The body is not broken so much as it is braced. And a braced body cannot heal, no matter what you feed it or how carefully you avoid the world. This is true for mold illness, for Lyme, for chronic fatigue syndrome, for sound sensitivity, for food allergies, for mast cell activation, for POTS, for PTSD. Different doors, same hallway.

What brain retraining actually is

The brain learns. It learns what to notice, what to expect, and what to prepare for. And what it has learned, it can relearn — differently. That is neuroplasticity, and it is the most hopeful sentence in this entire essay.

A nervous system that has lived through poisoning, infection, and trauma stays on high alert. Ordinary sensations feel alarming. A symptom brings fear, fear heightens attention, and heightened attention makes the symptom louder. Around and around it goes, until the whole system is exhausted from guarding against a world that is mostly trying to be safe.

Brain retraining is the practice of teaching the brain and body a new pattern: more choice, more steadiness, more room between a sensation and the alarm. The physical work still matters — the detoxing, the binders, the clean food. I would never tell you otherwise. But when the brain is still braced, the body never gets the message that the war is over. Retraining is how the message finally gets through.

Here is what this is not. Nobody is telling you your suffering is in your head. Your reactions are real. Your exhaustion is real. I lived inside a body that could eat three foods, and there was nothing imaginary about it. But real does not mean permanent. That is the distinction conventional wisdom keeps missing.

Why the brain belongs at the center of the conversation

Here is what I want you to understand: when the brain finally came back online for me — during and after that 61-day fast, when a decade of fog lifted — I did not just feel clearer. I felt safer. And once my body felt safe, everything else I was doing for it started to work better. The detox worked better. The food worked better. The rest worked better.

That is the piece almost everyone misses. We pour everything into treating the body and almost nothing into telling the brain the emergency is over. Then we wonder why the healing doesn’t hold.

My own practice around this involves frequencies and noise-cancelling headphones — a ritual I developed during the sickest years, when writing and listening became the way I spoke to my own nervous system. I keep the details of that practice close; they are part of the work I do with people one on one. But the principle is simple, and it is yours to use: your brain is listening to everything you tell it, all day long. Start telling it the truth. The threat level is lower than it believes.

My body, my story, my choices

The modern world can feel like a lot for a body to carry. Fluoride in the water. Mold in the walls. Flame retardants in the furniture. A tetanus shot that changes everything. I believe the modern toxic load can overwhelm the body’s pathways — and I believe a nervous system marinating in that load learns to live at Defcon 1.

For me, taking the reins meant refusing to hand over my sense of what was happening in my body. The more I followed what was called “conventional wisdom” without listening to myself, the worse I became. So I stopped listening to it, and I started listening to my intuition. That decision changed everything — it is the subject of my next essay, and I will tell you the whole story there.

NEVER outsource your health. Not once, not a little, not for convenience. No one will ever live inside your body but you. I took my life and my body into my own hands, and that decision is the only reason I am sitting here writing this with a brain that works.

A gentle writing practice for the stuck places

When I began writing in 2019, I was sick and did not know where my story would lead. I did not need to know the ending. I needed to begin.

What grew out of that beginning is now called Story Is Medicine — my practice of using story to rewire the brain. Think of it as yoga with pen and paper. Because here is what I learned in that bed: your story is not just something you tell. It is something your nervous system listens to. Every sentence you write about your past tells your limbic system what kind of world you live in — and every sentence you rewrite gives it new instructions.

Here is how we begin. Find a quiet place. Light a candle, and invite your ancestors or guides in. Put on your headphones, start with love — 528 Hz — and allow the frequencies to open your heart. Then finish these sentences on the page, letting the writing happen on its own:

• Don’t overthink it, just begin: I should have… I should be… I should…
• The threat my nervous system is still guarding against is…
• What I would do if my body felt safe is…
• What I am ready to take into my own hands is…

Don’t try to make it beautiful. Don’t edit your way out of the truth. Let the words arrive as they are. This is the doorway into Story Is Medicine — the practice I teach in my courses and 1:1 coaching, where we go much deeper: guided visualization, rewriting the narratives your body has been living inside, and reconnecting with the younger versions of yourself who have been waiting all this time. The story that got stuck is the story that can heal you. Sometimes the first step is simply hearing yourself.

You don’t have to know how the story ends

During my 61-day juice fast, I cleared 15 pounds of mucoid plaque, and more than anything, I remember my brain coming back online after a decade of fog. But the fast alone did not keep me healed. What holds the healing in place is the daily work of a brain that no longer believes it is under siege.

If you are standing at a crossroads in your own story — mold illness, Lyme, CFS, PTSD, sound sensitivity, food allergies, a body that flares at the world — begin where I began. Put on your headphones. Give yourself a few quiet minutes. Tell your brain the truth. You don’t have to know how the story ends. You just need to begin.

And if you want a guide, don’t do it alone. Reach out to me at michellekatz2010@gmail.com — this is the work I do, and I would be honored to walk that road with you.

And if you want the whole story — the tetanus shot, the years of illness, the fast, and everything that came after — it is all in my book. Awakening in an Age of Metals is where this journey lives in full. My essays on Substack hold more of it too.

What if you could heal your brain — and end up with a book?

Here is the part nobody sees coming. When I started this work, I was not trying to write a book. I was a television producer who could not remember anything, lying in a bed that had become my whole world, putting on headphones and writing because it was the only thing that still felt like mine.

I healed my brain. And I ended up with a book.

That is what happens when you retrain a brain that spent a decade in survival: the signal comes back, and the story comes with it. The same pages that helped me quiet the alarm became Awakening in an Age of Metals — a memoir of illness, awakening, and reclaiming my voice. The healing and the book were never two separate projects. The writing was part of the healing. The healing was part of the writing.

So let me ask you the question I wish someone had asked me: what if the thing you are doing right now to survive — the journaling, the trying, the refusing to give up — is not just getting you back? What if it is making something?

Your brain can heal. And you might just end up with a book.

Closing reflection

What might change if you stopped asking, “Why is my body doing this to me?” and made room for another question: “What has my brain learned — and what can it learn next?” Your body is yours. Your brain is yours. Take the reins. Begin.