@pljauthor I think you need some more information on if your symptoms are, or are not related to your spine. Compression of the spinal cord can cause incontinence and problems with bladder or bowel control. Sciatic pain can be generated by a spine problem, or if can be a pelvic alignment problem causing muscles to compress nerves that go to the legs. Before anyone offers to do surgery, you need this figured out.

I would recommend getting second opinions from a spine specialist and a urologist, and even a physical therapist may be helpful with an evaluation.

Here is some information about lumbar plexus compression syndrome which mimics a spine problem and causes sciatic pain.

MSK Neurology - "How to identify and treat lumbar plexus compression syndrome (LPCS)"
Posted on March 30, 2017 by Kjetil Larsen
https://mskneurology.com/identify-treat-lumbar-plexus-compression-syndrome-lpcs/