Do your reading and come up with some good succinct questions for the doctor. Please keep us posted with your decision and situation.
It's been so long, I don't remember really how long it was when I noticed things improving - although I do remember it was 2 years until I needed thyroid medication.
As I posted earlier, I did gain 15-20 lbs. during the hyperthyroidism. Well, the hyperthyroidism can be gradual over many years but I think the weight gain was probably over a period of 2 years. I do recall though, after the RA iodine treatment, I did not gain any more and I lost it.
But bodies are different. I only had 20 lbs to lose. I do understand your fear, as I would have it too.
You have an autoimmune disease, so be on the lookout for other things, like pernicious anemia, which I developed about 16 years later. But you probably know this already.

