What Causes Swelling And Itching In Vagina After Sex?

Well the yesterday morning around 3:30 a.m me and my fiance had sex after I got home from a party.
When we had finished I passed out......and when I woke up I was swollen and itchy in both creases of my vagina....today it is dry on my clit and my vaginal and it is also swollen and still itchy in the creases.