My thyroid tests have been coming back within normal ranges BUT my endocrinologist/infertility specialist seems to have found one of my levels low. I don't really know all the details - also involves my pituitary gland, I will recieve a letter from him going over our last visit). Doc checked my heart rate Thursday & I think he said it was 48! I'm wondering if anyone can fill me in on hypothyroidism, does anyone have a dual diagnosis & what seems to be symptoms of each other, (I'm wondering what is Fibromyalgia & what could be coming from the thyroid). Can it just take one level being a little low actually cause so many problems? Why did it take my firtility specialist to find a problem??? Ect, ect, ect. Could I have been misdiagnosed with Fibro & it's really my thyroid - even though all the "regular" thyroid tests have been ok? Any help at all would be appreciated! Thanks so much!