Dealingwithtos, I had the same thing happen to me last year when I got the SCS implanted. The RSD spread into my back & into my right rear end & hip where the generator is. They also redamage a nerve from a previos injury & made the pain down my left arm worse. I just changed pain medications & am off Fentayl where I couldnt use a heating pad. Before that my Mom had bought me a Thermaphore. Its a moist heat pad. Its soft but its provides wonderful heat & you cant get burned by it. I hope you find one that helps you.
Hugs, Denny