I've Been Having Sex With My Girlfriend Recently And She

I've been having sex with my girlfriend recently and she is an ejaculator and I didn't wash when I got home in the night and I woke in the morning and the tip of my foreskin was hurting a lot and has been for a few days now I had tiny little blisters with clear liquid in them and the area has been sore for a number of days, what do I have and how do I treat it?