My doctor kept doing tests, really reluctantly, right up to the one where my TSH was four thousand times higher than the top end of the normal range - I don't know if the samples never got checked at all, or there was something amiss, but I was told that it is difficult to diagnose (which I thought strange as I had all the symptoms listed) It took a long time to correct, as I was in a dangerously low state by the time I was diagnosed. If you had one test went were told your thyroids OK, I'd advise checking for the symptoms, and prompting your doctor about it in future if things don't seem right.