I am very sorry to learn that you are feeling so poorly. I know from personal experience what it feels like to be at the end of one's rope and recieve no help from the medical establishment.
Might I suggest a leaky gut test? There is a definitive test for leaky gut involving mannitol and lactulose. Given your situation, leaky gut might be worth exploring. A hair mineral analysis, and a saliva hormone test, are worth a look.
I assume that you have alredy had your thyroid hormones tested.