I am a male and two days ago I received oral sex from another guy that maybe lasted 15 seconds before i stopped him and left. We were still clothed and standing up. Beside him stroking my penis as well for a few seconds, that was all that occurred. I am feeling guilty and nervous that i might have caught something. I tend to be a bit of a hypochondriac . So I start feeling that I have symptoms. What are my chances that I caught a STD in that window. Please help. I also tend to suffer from chronic pelvic pain syndrome when I get stressed out and believe this is what is going on, since this started less then 48 hours after the encounter. I tried a AZO strip and it came up negative. Please Help