Hey Donna,
Very sorry to hear about this!
What I do have to say is that having your thyroid removed and radioactive iodine isn't bad at all! I am 25 now and was diagnosed with thyroid cancer at 19. I had my thyroid removed and then radioactive iodine therapy. I take synthroid every day and my weight balanced out(I gained about 15 lbs before they realized what was wrong with me). I do tend to get sick easier then most(but I also have a tendancy to be too busy and wear myself down) but besides that I feel great. Being on synthroid gives me enough energy to work 40+ hours a week, go to school, and get in around 15 hours a week on the bike.

I hate to say it, but you might be better off just getting rid of the thyroid and knowing that you will become stabilized on synthroid.

hugs to you for all of what you are dealing with!