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Hello and welcome. I'm Dr. Chip
This could be from a prostate gland infection from gas-producing bacteria, or it could indicate a fistula connection between your intestines and your bladder from the diverticulitis.
You need a urinalysis and culture and a ct scan with contrast to determine which is the problem and you may also need cystoscopy if a fistula is detected. That, if it's the problem, would require surgery to repair.
Please let me know if you need any more information