This is Dr. David
I am sorry you are having such bad back pain after your failed back surgeries.
you need to see a pain management doctor
and see if an implanted spinal stimulator can help with your back pain.
or a TENs unit for your back could help decrease back pain.
also you can try lidocaine patches on your back as well to help decrease pain so you rely on narcotics less.
also you should try acupuncture for your back pain.
have you had your prostate size measured? do you have enlarged prostate causing problems with urination
or do you have a neurogenic bladder?
why are you using a catheter to urinate? is it because your bladder muscles are paralyzed from the spine surgery? or is it because your prostate gland is too large?