Keep a cool wash cloth on yourself as much as possible. This will help with the swelling. I'm not sure a Dr can do anything. They may tell you the same thing I'm telling you, keep something cool on that area.
You may want to talk to your boyfriend about this. I understand that some people like rough sex but look what happened to you, severe swelling and pain. If you don't enjoy rough sex you really need to let him know.
I hope you feel better soon.