One of the most frustrating things about hypothyroidism, when it isn't adequately treated, is the brain fog that goes along with it. At least it's that way for me. I don't feel good when I can't think clearly. I am a high functioning person and I use and expect a lot of my brain all the time. When it's not working, I feel like I've shut down. My quality of life is so diminished when I can't concentrate that it depresses me.
When this goes on for a period of time, it can make you question the meaning of your existence, and not in the philosophical sense. I've heard people say it feels pointless to go on living like this. That's another reason why we need to be vigilant about our physicians' handling of our treatment. They might not have ever experienced brain fog, but I bet if a doctor had to deal with their own brain fog, they would understand. Completely.
Being an oncology nurse, I am constantly hearing about chemobrain, a phenomenon that many people experience when going through chemotherapy, and for months to years after treatment, or even permanently. I have never experienced chemobrain but from the way patients describe it, it sounds just like hypothyroid brain.
One of the newsletters I subscribe to featured this article on concentration recently, intended to help people experiencing chemobrain to function better. When I read it, I found it perfectly applicable to hypothyroid brain.
I hope this helps. I'd like to hear your comments.