Stay busy, busy, busy. This is important. Block her number and any other way she can contact you. Give her crap back if you have it and throw away the stuff she gave you. Go have fun, find a girl. Don't go back, no matter what trust me. That shady women will never change and it would always be in the back of your mind.
If its really bad, go get help and medication for it.
I feel for you brother, I know what it is like.