What Causes Bladder Spasms While Suffering From Diabetes?

Continual and repeated bladder spasms not caused by urinary trac infection. Tried several meds for the spasms with not much help. Spasms continue causing the feeling of constantly needing to go. There is no UTI but if there where the taking of Cipro cannot be done as Pacemaker put in aprox. 6 months ago. Had sticker surgery at KU Med approx. 3 mo. ago and the ability to empty bladder greatly improved. Had been to Urologist several times since as continual bladder spasms have greatly disturbed my night time sleep and cause continual discomfort at work. Had several images at Urologists and they continue to say I have no urinary trac infection. Have continued following this making sure there is not infection but continued bladder spasms have NOT subsided. My endocrinologist has thought it might be different types and levels of diabetic meds possibly adding to the problem but no change in the levels or types of meds had resolved this issue. Continue currently Diabetic taking insulin. Could the trauma from the past urinary surgery be adding to the spasms? Just a thought. Even if it where none of the spasm meds have helped stop this sensation and I am not always able to completely empty my bladder at times giving the need to go back to the restroom maybe 10-20 minutes just after going. I am only getting about 3 hours sleep per night. At wits end Doc. Suggestions please