I have hypothryoidism and tried ever diet you could think of and nothiing, I'm tried of feel so big... :(

What should be done to stop smoking

Well, I'm a hypothirodist too and as you said I have tried every diet there is as you did, but nothing worked. But my doctor recommended two things that will for sure help, and they did I lost 9kg which is about 17 lbs by using sea kelp as a nutritional supplement and working out offcourse. So diet + work out (1 hour per day) + sea kelp supplements. Hope it works for you as it did for me toodles!