Prostatitis or PVPS?

Intense cramping during/just after ejaculating. Started one day randomly, about 9-10 months after my vasectomy, and has been going on over a month now. The cramping pain definitely feels centered around my testicles and lower abs.

Finally got into my urologist although I was only able to see his nurse. She says it’s prostatitis and I need to change my diet to see what inflames it. This seems a bit dismissive to me, and I could be wrong but I don’t have any other prostate symptoms- there is no burning etc. What do you think?