What Causes Swelling And Bleeding Through My Vagina After Having Sex?

Hi...sex question. Last night I had very rough sex for a prolonged period of time. When we finally finished, I noticed my left labia was swollen like a balloon. Also, when I urinated, I found that I was bleeding. The swelling has continued for a good twelve hours, and I still am finding occasional drops of blood. I read online to put an ice pack down there, but it has not really affected the swelling. Any ideas what's going on?