Hi mourning, are you still getting labs now and then? The first thing that occurs to me is that your Synthroid dose may be too high. I think current labs would be the first step. That happened to me, once. I had been on the same dose for years, and all of a sudden, it was too much, so it was very SLOWLY tapered, with labs spaced about two months apart.
From what you say, if nothing else is going on in your life to cause those symptoms, you could be getting hyper. What is your heart rate? Is it increasing. Are you still seeing a doc now and then for thyroid labs?
Welcome to the board, if this is your first time, if not, welcome back!
Shirley