Why do i have throbbing itchy pain on my vagina?

So like 3 days ago, i was with my boyfriend and we were in the moment right so we had sex, & he went down on me and he bit alot! and so the next day i was starting to feel a little off my vagina has had an itchy buring irritating sensation and real dry and some weird looking discharge but not alot and just hurts to walk, is it something serious?