It's really hard to block words, especially coming from someone as important as your mother. I have a parent who was an alcoholic so I learned pretty young that his words weren't really about me. It was just his own problems talking. If you end up going to your mom's, try to keep that in mind. The hurtful things she says to you aren't really about you, they're about her. They're her own problems. (Easier said than done, I know.)