My knee-jerk reaction is to find someone new.
My thoughtful, non-impulse driven, response is more cautious. Is she a good RE? I wouldn't give up good care because of personal differences. Our urologist is a blunt research-type fellow, but he's great at what he does. We don't go to him for his personality. You see your RE to get knocked up, not to make new friends. If you aren't happy with your medical treatment that's another story.
Here's the other piece...have you told her it bothers you? Some people talk like that, some don't; some people like it, some don't. She's not a mind reader. It's an awkward, but adult conversation. "I've got to be honest, I've always been a little uncomfortable being called dear/sweetie/dumpling/cupcake. IF appointments are uncomfortable enough already. Would you mind calling me ___ instead? I would really appreciate it." If she doesn't know you don't like it there's no chance for her to fix it.