I'd also encourage you to see another doctor and have them test your thyroid. It took me two years to have my thyroid condition diagnosed and only after I found an endrocrinologist who would see me without a referral from my GP. You might request they also test you for antibodies that are associated with Hashimoto's disease - my TSH was normal but my antibodies were sky high. Just a suggestion of course.

I too gained a lot of weight though my eating habits had not changed and I was exercising on a daily basis for at least 40 minutes. I was extremely tired (literally fell asleep talking to students and could not drive to Louisville because I could not stay awake), my skin was extremely dry, I was always cold and I had a very hard time staying focused. It was a huge relief to finally find a doctor who would listen to me and not base everything on numbers on a lab report. It was even a bigger relief to find out I was not crazy nor was I depressed as had been suggested by my GP. My life has improved 1000% since I started taking my medication for my thyroid disease and I gladly take that little pink pill every morning. Oh what a difference it has made.

Good luck and keep us posted.