Why are you taking a diet pill if you don't want to - just say NO! You need to take responsibility for your medical decisions, not leave them up to anyone else. Diet pills can be dangerous.

I realize that she may be your only choice-BUT-you don't have to take them even if she suggests them. Tell her nicely that you HAVE already lost some of the extra weight through dietary changes and exercise, and if the thyroid testing comes back and shows that you have no problems there-then you would prefer to continue to do it with diet and exercise alone-no pills.

Short and sweet. You just have to tell her-plain and simple.