AZO might help. All opium products are prescription only. If you want to try MJ, I recommend vaping. Quick action like smoke, but without the smoke. Edibles are more long lasting, but hard to tell what the best dose is, because it takes so long to take effect.
But, be sure to keep your surgeon in the loop. When I had serious tailbone pain with sitting, it turned out to be a presacral abscess. After a month of this pain, I spiked a temp of 105, landing me in the hospital for two weeks. Your bladder issues may be related to something nearby, but not the bladder. The point is that your pain should be gradually improving if all is well.
Jan 