On January 26, 2010, I had unprotected sex with girl I've known for a long time. During the sex I got a burning feeling so I stopped. I started itching within the hour. Also felt like I had something clogged in my penis. The next day I realized I couldn't get an erection and I had what looked like a friction burn on my penis. I also had a flu symptoms. And my body just felt weird. Within a few days I was able to get an erection. I thought it might be yeast infection so I looked for online cures. I drank apple cider vinegar, itchyness 99% gone. Flu symptoms also went away in a day or two. I have tingleing sensations, and a rash on my penis, no discharge, but rash is isolated around the rim of the penis. This is three months later and I am still having rash and slight dicomfort. Rash is just red. Are most problems anxiety due to sex being with someone other than my wife. Or is it a yeast infection? Or STD? Please help.