i'm so sorry to hear that you're experiencing this. it sucks (and i know). first, re: the supplements - know that you have to take them for 6 months to a year before they start working (in the event that you start to get discouraged). second, though you've ruled out your thyroid as a factor, there are other medical conditions that also need to be explored as a cause. first, if your hair loss seems like a massive shed, it could be due either to seasonal change or a delayed reaction to stress. this is nothing to worry about as it will end. second, you should get your hormone levels checked by your doctor. excess testosterone/androgen and/or adrenal-related hormones can also cause hair loss (this is my problem). third, if both of the above fail, your dermatologist can take a biopsy to test for bacteria/fungi. from what i understand this is uncommon though. of course, if all of the above have been ruled out, then it is likely that you're dealing with something genetic. whatever the cause, it is horrible and i send a big hug out to you. in the meantime, just remember to take care of the hair you have.

best of luck and let us know what happens.