Bruce sounds like you need a Sat phone if a sleeping pad can immobilize you
I've had two back surgeries myself and know all about the pain but I assure you that until the nerves are severed and my legs don't work I'll get myself out. One thing the military did for me was show me that I could endure much more than I thought I could. I walked into my surgeons office and after surgery he commented that after seeing the damage he didn't know how I walked at all. Bruce , when your life is on the line if your mind is right you can march through hell. If you decide you can't then you're done. Not saying it would be easy but if you walked in I'm betting that despite you inflaming the nerve you could walk out.
2 words. Tenacious Tape. Get some and stop worrying