disfunction after oral sex in car!

hello there, i'm 52 yrs male. 2 years ago i received oral sex from a sex worker while i was driving my car. At the time sperm ejaculation I given a strong emotional stroke in her mouth/throat and noticed a bit of pain. After a week i found a swelling in the inguinal region ( 2 inches forward of the anul hole) and from that time i am facing erectile disfunction of my penis while i intent to meet my wife. But if i do handjob or view porno my penis partly erectes. i am in great anxiety. can any body suggest me to come out from this curse.