Yes my weight has slowed considerably now too, but I do eat quite a bit as well (low/no carb). There's a lady on an american website (about.com?), who also suffers with thyroid, and she always said low carb was the best kind of diet for anyone with thyroid issues. Mary shomonon or something? I used to subscribe to her emails years ago when i was first diagnosed and thought I was going a little crazy!! I'm pretty sure I read it there somewhere on there? Shes big in taking on the pharmaceutical companies and docs who say we're ok and within range, when its not right if you're feeling tired etc.
Sorry for rambling on ;-) x