If it were me, I would ask your doctor to run the thyroid antibody tests (Thyroid peroxidase
antibody and Thyroglobulin antibody) to see if you have Hashimoto's. He should also check
your free T3, free T4 and TSH although the results will be different since you are taking
Synthroid. But if you have low T3, you might have trouble converting T4 to T3.
A lot of people feel better if they take some T3 along with the Synthroid (T4). Your doctor
might prescribe a synthetic T3 (Cytomel) to take with the Synthroid or just take ARmour.
I take ARmour and I know that I feel much better on ARmour than on Synthroid. You could
check the website for information:
Mary Shomon has information about finding a good thyroid doctor, what to expect, etc.
She also has a directory of the top thyroid doctors in the US by state so if you decide to
change doctors, you might look at the list and see if any are listed near you. The link is:
There is also an interesting discussion about Synthroid entitled "What to do about unwanted
Synthroid side effects" that I thought of when I read your post. The link is:
Scroll down the page. I think that discussion is about half-way down.
Good luck. I really hope you find relief. Don't give up until you find some answers and some help.