Hooking up with some random guy could backfire on you and just make you feel worse. I'd suggest instead keeping busy and going out with your friends more. Even invite them over to your place for a girls evening of wine and movies if you don't want to go out or buy yourself a new outfit or pair of shoes that make you feel good .... anything to keep your mind occupied with something else. A lot of girls in relationships tend to ignore their friends, now is the time to remember they are there for you.