Please can you help me understand what the S.C.S does? I was too freaked out when the Dr. was talking to me about a month or so ago. I heard that you do a trail first. What is that??? Do they cut open your back for the trail?? Does this only work for the back and not the neck?? Please any help would be nice. I am going threw too many injections with too many pain Dr's and I need to find something.