So between 2013 and 2019, were you sexually active? I ask because if you were, and just had 2 instances of sex that caused symptoms 6 years apart, that's one narrative. If you weren't, and both times you had sex in 6 years you got symptoms, that's a different narrative.
The lack of WBCs in your urine rules out NSU, but when you do these urine tests, are you waiting an hour since you had last urinated, and are you giving the first part of your urine stream for testing?
So assuming the above is true:
1. Timing of these exposures and Prostatitis symptoms recurring are coincidental??
Yes, I would think so. What kind of diagnostics have you had this time? Given your age this time around, the cause could be something different, too. It might be BPH vs a non-bacterial prostatitis. A urologist can help determine that.
2. Maybe the anxiety of not knowing and dwelling on it has induced Prostatitis symptoms??
I'm sorry, but I'm not sure what you're anxious about? You don't have an STD - that's been ruled out. Are you concerned that every time you have sex, you'll get prostatitis? If these are your only 2 encounters in 6 years, that's a fair question, but without knowing that, it's hard to answer. Also, the cause could be different, and this could be a really, really unfortunate coincidence.
3. Could this have been an undiagnosed NSU that is causing these problems and is still causing ongoing problems? Would lack of discharge and WBC’s in urine and culture rule out an NSU?
The lack of WBCs rules out NSU. Not every man with NSU will get discharge, but the diagnosis is made on WBCs in the absence of other symptoms.
Have you seen a urologist? If you haven't, you definitely should.