Maybe it's tennis or maybe it's swomeng or maybe you can find someone to play frisbee with in the park. Anything to get you moving. If its something where you can thrash the heck out of something go for it. Like women's tennis where they yell and lob these incredible shots across a net at an opponent.
Finally, you need to think about the source of your anger and sadness and make changes. Think about your future and what you want to do. Set some goals. If your boyfriend isn't someone you can talk to anymore then maybe you should be on your own for awhile. Find a hobby to be passionate about and find out what you're made of. I bet you're capable of some amazing http://www.reviewlization.com/old-school-new-body-review/