Hi. About 3 months ago I had protected sex with a girl who I think has had a few sexual partners. We spoke about stds and she said that she is all clear of anything.

About a two months ago I got a very light rash on groin (like joch itch). I do alot of sports. I also had pain in my left leg (maybe old footy injury). My local std clinic tested me for eveything accept herpes (no blisters or sores). All results were negative
now (3 months after sex) I have the same groin irritation which goes a little red then goes away. And I also have a stiff neck, headaches and feel very tired and weak. My back also aches. Do you think I could have an std (maybe herpes) or could it be flu (its flu season at the moment). Could the groin irritation be joch itch or something (no blisters or sores anywhere). Maybe I am worrying over nothing. Please help me.