Your symptoms are suggestive of some pelvic inflammation and this needs to be assessed with your gynecologist. It is not enough if you have your urine tested. You may also need a pelvic scan and other tests. Bladder prolapse is not common after hysterectomy
if the perineal supports are well secured. Also, pain of this intensity is not a presenting feature unless there is some pathology. I advice you to see your doctor for an assessment and followup. You may also need a urologist's advice. Wish you speedy recovery.