Let me tell you this. You are not dying. It's that simple. Brain Fog, Thyroid, Adrenals, etc are very debilitating, but not deadly. Unless you have severe addisons or adrenal crisis, which you aren't having most likely.
Ummm. Not to be rude, but if you have high TPO antibodies you would be Hypothyroid, not Hyper. Is this what your MD told you? Also. I would suggest seeing a doctor that knows about AF, and can help you.
The thing I always told myself was this..
Low Energy = B12, Thyroid, Aldosterone
Low BP= Low Salt
Now. All of things are easily fixed! That's it. That easy. Find a good doctor, and there you go :)
If you need any more help finding a doc, email me.