You have the results of two previous biopsies, both showing negative for PCa, so that is a good sign. PCa is slow-growing, so even if your latest biopsy shows it, it won't be very far advanced, and so should be "curable". PCa in its early stages shows no symptoms, so your pains and urinary problems are not likely to be caused by that.
However, given your BPH and history of prostatitis, it could likely be another bout of that. The biopsy will reveal all. Fingers crossed for a good result....
Age 63. Other than cancer, in good health; BMI 20
Pre-op: No symptoms; PSA 5.7; Gleason 4+5=9; cancer in 4 of 12 cores
7 March 2008, RRP, non nerve sparing
Two nights in hospital; catheter and staples out after 7 days
Continent, no pads needed from the get-go
Post Op: Stage pT2 M- N-; clear margins and lymph nodes; Gleason 4+4=8; prostate weight: 37gm
6-week and 7-month PSAs: 0
Bimix injections working well