Doctors could not find a thyroid problem if it bit them in the nose. TSH is a worthless test. You are better off measuring body temp.
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TSH-Why its useless - STTM
http://www.stopthethyroidmadness.com/tsh-why-its-useless/
You are also better off by noting symptoms. Are these your symptoms?
http://www.stopthethyroidmadness.com/long-and-pathetic/
How to find a good doctor. Clearly your doc knows NOTHING about the thyroid.
http://www.stopthethyroidmadness.com/how-to-find-a-good-doc/
Let these documents be your bible:
http://www.stopthethyroidmadness.com/site-map/
https://sites.google.com/site/violienshealth/thyroid
I suggest fixing the basics before letting the men in white coats prescribe drugs for you:
https://sites.google.com/site/iodinereferenes/optimal-health
Grizz
You can get an inexpensive spot blood test to see if your D3 levels are optimum at 70 to 80 ng/ml. With 20,000 IU daily I'm sure you are spot on.
http://tinyurl.com/Vitamin-D-Report
Taking 10,000 IU D3 daily put an end to my annual SEVERE chest colds that I had been suffering for DECADES ! Also ended getting the Flu. I refuse to take flu shots.
Grizz