I had'nt had sex for three years, that is until 11 days ago. It was unprotected sex and within 4-5 hours my penis had a constant burn feeling in it. Pain went away with urination, but came back afterwards. As I said, it has been 11 days since the occurence and the pain comes and goes. Now my scrotal sac is red and burns, also my left testicle hurts some. I know you can't believe everything you read on-line but I am scared to death that I caught some kind of disease. Should I be worried about an std? Is it possible to feel std symptoms within 4-5 hours or is this a simple bacterial infection or allergic reaction to something? I hate to admit but have been having marriage problems, married for 17 years with 5 children. Maybe could be guilt, the pain feels real though. I am scared to go to my family physician, all good friends as are the nurses, etc., live in a small town. Any advice?