Greetings! may I ask if you had an abdominal hysterectomy or a vaginal hysterectomy...was it total, sub-total?
I do think you should have some basic tests done first to rule out any lurking infection or other forms of cystitis as well as any bladder neck issues whether as a consequence of surgery or otherwise. Once you've had these looked into, there are some natural methods that can help with your symptoms and they include herbs, homoeopathy, pressure points and more. Will wait to hear back from you.