Don't self diagnose or self-medicate
Self diagnosis and self treatment is extremely dangerous, especially if the guys have been using the stiffener drugs (V, C et al) and even more so if they have been using the generic home-made street variety (with the accompanying loads of impurities).
Drug interactions are very dangerous, especially in guys who are older than 55. Taking random doses of various stuff (some guys cannot even spell them properly) to treat a non-specific self-diagnosed pain in the penis is fraught with danger.
Disregard all these self-diagnosing advisories from quacks, and if you want to persist with bare backing then be prepared to factor into your budget a genuine, legitimate consultation at a reputable STD clinic.
Ning from Nana Plaza Mandarin (not the top-floor one)
First beer at Rainbow 4, some eye contact and long-distance facial interaction (pouting, raising eyebrow, asking to twirl): good warm-up but no joy. I mentally rated every girl on a beauty scale from 1 to 10, on a body-mass-index scale from 18 to 25, and an age scale from 19 to 40 years old, and there weren't that many that came anywhere near the upmost quadrant. One of them, who was Latina-looking, did, and her eye contact behavior indicated that she was not looking for any business from me.
Went up and down Soi Nana to see if any freelancer was catching my attention, but that also came to nought.
Then I took the escalator to Mandarin. There are two entrances: one on the left for the top-floor, one on the right. I pretended to hesitate and some girl jumped at me to pull me one way. I think it was right. Anyway she clearly had laid her eyes on me because then she accompanied me, asked for a lady drink. Which I proferred. And started rubbing my cock through my pants right in front of everybody else, including the other girls with whom she was obviously very friendly (but in a competitive way?
She was a 7 (I do not charge for braces, even though I should), BMI close to 19, age about 25. Her name was Ning. She was suprised I could remember it after we had gone to the room. I did not test her on her memory of my name, for the outcome would have been obvious.
Anyway, not my type because too tall and tits too small, but you've got to experience variety in life. I negotiated her price down. The barfine was reasonable. She guaranteed BBBJ so it was a go.
She was a bit of an hyperactive bunny. I could have told you that at the bar already. Not necessarily bad, as these girls don't tire easily. It took her a while for her to bring me to completion, but it was still within the realm of reasonable for a short-time outing, and to be fair she didn't try that hard to hurry me along. All in all a satisfactory release.
Would I recommend? Only if you're into tall skinny girls who are hyperactive. Then she definitely delivers in the sack.
Would I repeat? Not in a million years, now I've got the reputation as the guy who fucks her too long she won't touch me with a ten-foot pole.