take a day. drink yourself into oblivion. then wake up the next day, puke, lay around on the couch nursing your hangover.
the day after that, go out and start doing shit. sign up for online dating. go hang out at whole foods and look at all the other hot bitches you can date. sign up for a class. do whatever you have to do to distance yourself from this broad.
and for the love of god, DO NOT BANG HER AGAIN.