i really think I have an under active thyroid, but blood tests always come back negative. My hair is thinning and feels coarse, my nails flake and I seem to have fatigue on top of fatigue, if that makes sense. I know that if I'm borderline these tests won't show anything, but that there are other tests that can be done. Has anyone ever asked their GP for the tests and had them done? I've been a bit reluctant to go and see my GP about it as he'll probably say it's just fibro.