That is crazy how much your stories match up with mine. My anxiety and heart palpitations have been gone for over 8 months, my hair is thickening up slightly, the shakiness, dizziness, and postural hypotension are gone as well. I can easily fall asleep now and sleep through the night.
What is left is not really brain fog, but what I guess you could call lazy thinking. I don't have much motivation for anything anymore and nothing really excites me. Just like you, I am very Type A. In the last few weeks, I started taking Armour for the first time and I have been taking large doses of Iodine for the last 6 months or so.
I really think that I have been hypothyroid my whole life (overweight, not much energy, etc.) and getting some sort of infection three years ago stressed my HPA axis to the breaking point. Now that that is much improved, the hypothyroid symptoms remain but to a greater level than before I got sick. I am also sure that my body is still fighting whatever infection I got three years ago. I am strongly considering getting tested for Lyme, EBV, and the other usual suspects.