... 137 MCM of Synthroid ever since. I'm 56 years old. I weighed 173 at the time of surgery. Today I wt 245. None of my Drs think it has anything to do with my thyroid medicine. I have been steadily gaining wt. my TSH is at .19. Every day I work at losing wt. sometimes after a week of working hard at it, I will actually be up a pound! I'm worried and hate that I've gained this weight. Any advise for me?