Welcome to the forum. You have learned a lot by reviewing other threads, and you accurately cite Dr. Hook's and/or my responses to similar questions. It really helps when questioners do that. Thank you!
Bladder "discomfort" and urinary urgency rarely are STD symptoms at all. The discomfort associated with NGU is strictly localized to the penis (usually felt only at the tip) and generally occurs only during urination. And usually, but not always, there is an obviously abnormal discharge of pus or mucus. On the other hand, general bladder and lower abdominal discomfort, and a sense of somewhat frequent or urgent urination, are classical symptoms of genitally focused anxiety. That is probably what you have. I'm reinforced in that opinion by your own words: whenever someone suspects his or her own symptoms have an emotional or psychological origin, probably s/he usually is correct.
Should you be treated? No, not in my opinion, unless you develop objective evidence of urethritis -- discharge, increased white blood cells on a swab from the penis, etc. If your doctor decides to treat you without that evidence, it's really a shot in the dark -- probably no infection, and perhaps just reinforcing your anxieties about this. In any case, the standard treatments for NGU are doxycycline or azithromycin, not ofloxacin or related drugs.
I suggest sitting tight. If your symptoms persist, get examined directly -- don't accept a phoned-in decision. My bet is your symptoms will fade, and that you don't have any infection at all from your oral sex encounter.
Regards-- HHH, MD