I'm so sorry for you, this must be awfully discouraging. But please keep in mind this: it's not about your illness or your "being different", and not even about you. People make stupid comments for the sake of talking, and criticising women's body is probably one of the easiest topics to get when they cannot find anything remotely interesting to say. That woman is too fat, she surely has an unhealthy lifestyle. The other one is too thin, I bet she's anorexic. Look at that, she is too tall, how dare she wear those heels. I heard this last one oh so many times... I barely wear any heels now, but it's to protect my poor joints, surely not to please "the audience"!
Unfortunately, I have no magic trick to help you deal with those airheads. Maybe an ipod and some good music?
PS: ok, men do have their share of body-shaming, but quite little in comparison.