Nope...I don't think med science has made much in the way of advances re:
Prostatitis.    I am surprised, though, that med science, more accurately,
the pharmaceuticals or big money groups, have not investigated this to sell
more diagnostics and meds.     As for your world, did they take blood
samples, maybe even a biopsy of the prostate, and semen specimens to test to
determine what exactly is the bacteria that is causing your infection?
That should have helped to narrow down the type of bacteria,  possibly the
source and the doctors ought to be able to work from there. I understand
that a bacteria can invade the body at just about any point of entry from
fluid exchange with your partner, to broken skin in places as innocent s the
arms and hands, to improper dental hygiene.    Chlamedia (spelling??) can be
present simulataneously in the prostate, the gums of the teeth, the heart,
arteries, etc...as an example and is very difficult to eliminate.   Other
bacteria are fought by doctors prescribing anti-biotics for several weeks,
when they ought to be prescribing for 6 or more months.   Also, your sexual
partner needs to be taking the same meds, for the same duration as you,
else you can transmit the infection to your partner's blood stream and after
the doctor cures you of yours, your partner can then transmit it back to you
again.  It's pretty complicated to treat prostatitis.   Wishing you the very
best of success.