When my tsh was too high (7 maybe) I was told it was from the pituitary gland and was because the thyroid gland was not working right. ( I had two small benign nodules.) This was in 1988 and I have been on Synthroid since and my number are ok 99% of the time. A small adjustment in dose is made if it goes too low. TSH too low means too much thyroid hormone. I cannot understand a doc not being able to help-you see an endocrinologist? My doc says the TSH is what matters.