hi doctor. 3 days ago i had protected oral and vaginal sex with a sex worker. In the last couple of days, I have had an increased sense of a need to urinate, going several more times a day than normal. sometimes the feeling comes as soon as i have just urinated. further, there is a small chafing feeling in my groin . it started when i was cycling home from work. it was warm out and i was wearing loose underwear and trousers so that may be the case there. also, there is a tingling sensation i feel around the tip of my penis. I m very aware of it, whereas normally I m not. Could this be the sign of an STD or is this anxiety induced? I am in a very commited relationship and I made a mistake. Thanks for your time.