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Long story short:
Suffered from night pain intermittently for years (normal psa, no bacteria, etc). I decided to ask urologist number four if perhaps my symptoms were more indicative of IC ( interstitial cystitis) rather than prostatitis. He performed a bladder biopsy, found a high number of mast cells, sent me to an allergist, the allergist put me on Zyrteq. Problem apparently solved by an over the counter medication for allergies. Hope this helps someone.

PS by PF It has been estimated by some that chronic prostatitis may turn out to be IC in a few cases. Perhaps a cysto may settle the issue? Ask your doctor