I've been taking Synthroid for quite a long time. I still have symptoms of hypothyroid - tired, achiness, dry skin and hair (hair loss lately, in fact), brain fog, etc. Since I've moved several times in the last few years, I've had several doctors, including an endocrinologist, all of whom assure me that I have the correct dosage of Synthroid, so nothing is done. How do I convince them to go further?