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    Hi Jen. . .interesting the information we get from those doctors we must rely upon. My endo told me it would be around three months before I went euthyroid or hypo, and he was pretty close. I was still quite hyper 4 weeks post I-131, and it was difficult to tell when that changed, because I never felt “well” before going hypo, though I did have a few weeks of feeling less ill, around 3 months after treatment. A few people do have to be treated twice, but I don’t think you need to think about that now, as you’re probably responding quite normally. Let us know how it progresses for you. (A LOT of us didn’t lose weight, by the way!!)