Raised red spots/bumps, small broken blood vessels under skin of urethral meatus

I had unprotected sex last year and was tested negative for gon, syph etc. The urologist gave me 4 weeks 2 and 2 of different types of antibiotics at the time, shortly afterwards I notied that when my penis is erect the head of my penis is covered in small red bumps and broken blood vessels and the skim in very stretched and shiny. I get burning when I urinate sometimes and I also get a sharp shooting pain when urinating sometimes. I also get pain in my left testicle and some sort of discomfort around the area between anus and tip of penis, it feels like a twitching and as if fluid is being extracted but it isnt. Also when I a flacid there is always a red blush/rash/quite patchy to my meatus. i also had like a weepy graze type thing which was painless and cleared up after a day or 2.

This is causing me untold worries, I have had a urine flow test and digital examination by a nurse and apparently my prostate is fine. i am going back in october for a follow up with a urologist.

Any ideas? I don't think its Herpes... but its always on my mind!!