I have burning sensation in the penis after unprotected oral sex. Kindly help.

Hello doctor,

I received unprotected oral sex from someone I did not know, and I have been having symptoms in the genital area ever since. The onset of symptoms happened as follows. First, a few days after the encounter, I have a burning at the tip of the penis. This went away on its own. I got pink, irritated areas on the head of the penis. These comes and goes since then, and I still get them today. A few weeks after burning sensation in the penis also extends in the body. It extended to the anus when it first started, but it has partially subsided, and now I feel it in the area where the penis meets the body. This is persistent, and I feel it all the time. It does not get worse when urinating, but it does sometimes get worse when ejaculating. Pain just behind testicles comes and goes a few times during the day. But this still happens.

I was tested for all STDs, including mycoplasma, several times. They have come back negative every time. Azithromycin, single 1g dose, Doxycycline, Flagyl, and Ciprofloxacin for two months shows no effect. When I was given this, I was told it is not an STD. As I was in a relationship at that time, I kept having sex (not always protected). If this is an infection, I could have infected her and then been reinfected. I have been tested since then, though, and it is all still negative. I have done ultrasounds of prostate and testicles and cystoscopy, but no issues were found. Ibuprofen temporarily alleviates symptoms. This has been going on for more than a year now.

Thank you doctor,

I have been dealing with this for so long that I actually whether I did semen culture. I have also had urine tests as part of regular checkups and part of STD testing. All came back clean. Would a prostatic massage be the appropriate step now?