Try on my wedding dresses was horrible, fiancé and mom got into a fight

I have never felt so bad about myself before. I went to pick out wedding a dress today at David's Bridal. My consultant was amazing. My fiancé was there and my mother. It seemed like every dress I put on my mom had a bab opinion about. Every dress I tried on she said I was too fat for. There was this one really pretty dress that my mom picked out and when I tried it on she said it would look pretty on that girl (someone else looking at dresses) but it looks ugly on me. The whole appointment, my shoulders are too large, I'm too fat, my feet look ugly, my feet are man feet, I tried on this one mermaid dress and my mom laughed laughed at me and said "You look really ugly in that ". There was a ball gown dress I really loved and my fiancé said I looked gorgeous, so did the consultant, and even some other brides. I felt more confident. Then my mom said "Stop lying to her, she looks disgusting". My fiancé got pissed and said "You need to stop. I think she looks beautiful!" My mom says "Yeah well it doesn't matter what you think, and don't talk to me that way. Learn some respect ". My fiancé says "Then start respecting your daughter who is gonna be my wife!" So now they are going at it and I just start crying. I didn't get a dress... my fiancé has been telling me he thinks im beautiful and not worry about the stuff my momsaid, but I feel ao humiliated..... I don't understand why she had to say those things to me and make me feel so bad about myself