I have had thyroid tests for the past two years now; and was diagnosed with Thyroiditis, which means my body is attacking the thyroid; and sub-clinical Hypothyroidism. I am now taking thyroxin, a synthetic thyroid tablet once a day. When I first started taking it, I could sleep like a baby with pleasant dreams for the first time in a long time. But as for the tests, they were blood tests only. I thought Iodine was the natural substance which increases the thyroxine your thyroid produces naturally, but I am not a doctor. I had no panic over these procedures, only a longing to find out if this was my problem which was causing many symptoms. If you find out that this is your problem, maybe it will also be your solution for some of your problems. It is better to know and do something about it, then not to know and wonder what you could have done for yourself to help! Hope everything goes well. Please let us know.