It sounds to me like you simply irritated your vagina. Give it a few days, up to a week, to heal. If it's not healed by then, go to a doctor. Planned parenthood is a great place to go.
Wash with water but not soap. That will help relieve some of the stinging. it might also help to put just a little petroleum jelly on/around your urethra. DOn't have sex with latex condoms with petroleum jelly down there, but it may help with the stinging when you urinate by sheilding the surrounding skin from the urine. I used to be allergic to chlorine as a girl, and I had to put petroleum jelly down there so I wouldn't sting when peeing after swimming.