I am really rattled and shaky after visiting my elderly mother. Its not good?

I visited my mother today, she was always sporadically kind then abusive when I was a child and has always had alcohol problems. She was really aggressive today and kept trying to tell me what I should do and think, and kept shouting. I am home now but I am all shaky its horrible. Ive only just got my life on track now after a difficult childhood but I can see her ruining my life again now that she is elderly and demanding. What should I do in this situation?