Burning penis, increased after urination, with no other symptoms; what could it be?

[fraufals]

Hi, I'm a bisexual male. Last Thursday I received unprotected oral sex from a man, and on Monday night I started feeling a mild burning on the shaft of my penis, sometimes moving to my inner left thigh, and a little bit on the left side of my scrotum. The sensation is a little more intense after urination but it is not painful and urinating doesn't hurt at all. Further, there is no discharge, abnormal coloration, lesions, sores, rash, or any physical symptom.

I went to the std clinic, and am waiting on urine and blood work. I should note that the doctor found a couple "threads" in my urine, but I haven't since notice anything like that, so I don't know if it's in the normal course of things or not. Again, no milky white or greenish discharge. She placed me on doxycycline while I wait on the tests.

What I'm worried about is that I've had unprotected vaginal sex with my partner Sunday night, before feeling any symptoms, and climaxed inside her. On Monday night she performed oral right with the onset of the symptoms, and I went flaccid and couldn't finish. It is Thursday now and she has reported a sore throat; otherwise no symptoms. I'm frightened to find out what I may or may not have, but I figure I'd wait until the results before raising the issue and perhaps destroying my relationship. One last thing, she started developing a sore throat last night.

I know this is a long post, but does anyone know what I may have (as I await the tests)? It does not seem indicative of any STI, but is most certainly not complete paranoia. Could my girlfriend's sore throat be caused my a 1-3 minute blowjob without climax?