Is my mom a bitch or is she right?

So I had an appointment with my pyschatrist to try to get me on vyvanse for binge eating. When I went in, I explained I was gaining tons of weight and I had an issue with binging. My mother came in with me because I have horrible anxiety about being alone with men.

Anyways, me and the doctor are talking, he asked if I had an soda that day. I said yes, because I have migraines if not. And he said “well thats your problem. You cant drink soda”

And I said “uh ok” and then he asked me how much I eat. My mom chimed in and said that i eat more than my father. I could eat a whole loaf of bread. The psychiatrist replied to this saying “so youre the consumer of the household. I can tell” and he started laughing. At this point im trying not to cry. He asks more questions and he starts telling me about going on a diet (ive been on everyone you can possibly think of. At the time of this visit I was doing low carb, or at least trying with my binge eating) so hes rambling about a diet, and im so upset i dont even listen. Then he says “youre not even listening. Youre thinking about bread and what youre going to eat next” and at this point I walked out. I slammed the door, left my mom in there, and I ran outside and cried on the sidewalk while I called my fiance. My mother came back to the car and she was upset with ME. She said I wasted 50$ on tje copay, im going to be fat all my life and that medication wouldve be my only hope to look good at my wedding.

So is she right? Did I overreact?