It sounds like you might have a UTI. You should definitely contact your doctor to get tested. It could be prostatitis too. Both are fairly common after operations like this.
Prostatitis is basically an inflamed prostate, which can be triggered by both stress and nerve problems in the pelvic area. It usually goes away on it’s own once the underlying cause is gone.
Only your doctor will be able to figure out what it really is.
Clayton