I get so mad when I hear these stories. Find another doctor fast! Find one that will listen to you and treat you with respect. I put on a lot of weight when I got sick and even more because of meds. I had a doctor tell me that my breathing issue was because of weight. Another doctor I went to said "did you tell him that even healthy fat people can breathe?" LOL. That doctor said "yes, you have put on weight but the breathing problems started before that. Ignore the idiot and find a new one". I did just that.
Remember, these people work for you. You hired them and you can fire them too! Stand up for yourself. You know your body better than they do. If one is not listening then there is nothing wrong with going somewhere else!