I am a man, I met a male masseur 5 days ago and kissed him (short, less than a minute) - I touched his penis with my hands, briefly, and at the end, he performed oral sex on me for a very brief while (probably 10 seconds) when I ejaculated. There may have been very brief penis-penis contact although I don't believe so. He claimed he gets tested regularly, but I found out later that he is more than a masseur, he is an escort.
I have had, in the last couple of days, a very slightly sore throat and some clear white discharge while peeing - and have a very mild burning sensation. I generally drink a lot of water so it is not unusual to urinate a lot, and sometimes in the past I have seen ejaculate fluid in my urine although there has been no discomfort in the past.
The mild burning + discharge has got me worried, it was such a brief encounter, and I was really careful to stay away from his penis.
I have an STI screening scheduled for tomorrow, but am really worried - could this be anything other than an Gonorrhea/Chlamydia, some generic kind of bacterial or fungal Urithritis?