Namaste,
I have not had spinal surgery, but I use a TENS machine it helps relax my muscles it doesn't stop the neurophatic pain I expereince in my L4, L5 and S1, as there is no connection to the nerves. It send electrical impulses through the muscles, I do deep breathing exercises to help calm my internal systens down.

Don't know of that is of any use, but I thought I'd share my experience, I also have a BSC Sports Therapy degree so studied over 15 years, and used TENS machine for sports injuries, so it does have it's uses.

Tace care 🙂