Hi Jude -- I was face with a similar situation a few years ago. I had the SCS implanted, and it didn't work. I couldn't have the pump cause I wasn't big enough.
Why not apply for Social Security Disability? From the sounds of it, you'd probably get approved!!! From what I've been told, you can get an attorney on the first try -- hire one on contingency so you don''t have to pay him. He'll get his fee from your back wages, which will be NO MORE than 25%. (his fee, that is) Give it a try --- if you're denied, then APPEAL it. It won't cost you any more. Most often you do get approved on appeal. I had to appeal twice, and got approved.
I wish you the very best, Jude. I know what you're going thru. I too am a chronic painer due to severe spinal problems. God bless and PLEASE take care. Gentle hugs, Lee