You are not doomed, you can loose the weight. The only way I have seen success at all is to just say "I am going to do this, this is for ME and no one is going to stop me." I work for a company that is fairly large and when the CEO is in town he buys everyone pizza when he is in town, for the longest time I battled with this until the last time he was in town and I brought my own lunch, I ate it at my own desk and enjoyed it as much as I normally would have and there were no suprises in the food and I can plan with out worrying. As for the breaking habbits, I used to eat out ALL the time, now I pack my lunch the night before (most nights) and that way its ready to go in the morning, if I really feel the need to eat out I take my lunch and eat it in the car or go to a park and eat it. You may notice a difference too now that you have your thyroid pills, I have noticed a reasonable stall when I don't have mine. Stay focused and don't give up you will get over this hurdle.