Just found this thread again while searching through my email. A few months after posting this I got a sleep study done and got diagnosed with Narcolepsy, and reading this post again with the benefit of hindsight that was pretty clearly the case.
I am doing substantially better now that I have proper medication for my narcolepsy, and if anyone else is having similar symptoms, it might be worth while to see a sleep specialist.
I had blood work done fairly recently and the thyroid levels were within normal bounds. I will check the numbers tomorrow morning and do some research to see if that is a potential problem, but I don’t think so. I also am losing weight unintentionally not gaining it, so I feel like there must be something else at work here.