http://ehealthmagz.com/2019/01/08/what-is-a-sympathectomy-and-can-it-reduce-the-pain-of-crps/

If it involves needles, do your homework. If it’s surgical, do your homework. If it’s an implant of any kind, PLEASE DO YOUR HOMEWORK and look at failure rates. They’re ENORMOUS and you deserve better. Surgeons are always happy to make an incision, but you’re the deciding factor. It’s your body. We only get one.