I have a thyroid disorder too, which is pretty common and generally harmless in that it's so easily treatable. Unfortunately in the past my particular case has perplexed doctors and been linked to my episodes of clinical depression. My level was once so low that the doctors didn't understand why I wasn't in a coma.
Fortunately, it's been pretty under control the past several years so I consider it a non-issue most of the time. I'm just really careful not to miss doses and things like that. I don't like taking another pill every day but I consider myself lucky in that it's just one little pill once a day with no side effects. I know people in the other thread don't like the saying "It could be worse," but growing up in a family of doctors I know just how much worse it could be and I'm grateful for my health, even though it's not perfect.