Penis Ache/Burn

I very recently had unprotected oral sex (give and receive) with a partner who I came to find out has had many partners in the past month.  Again, oral contact only.  Within 24 hrs after, the tip of my penis has had a dull pain/burn.  It is now pushing 72 hrs and the same holds true, with no change.  I don't have any sores, discharge, nor does it hurt to urinate.  Basically, the dull pain/ache/burn seems to just constantly nag me.  Anyone experienced similiar symptoms?  I worry I might have a STI, but also wonder if it's my mind playing games due to the scare of getting one?

Thanks-

[boyblue]

Ask your Dr to test you for Trich..this was my situation as well...went undiagnosed for 2 years- especially if the tip gets real itchy and red..