Hi, I noticed this was an old post, but I too was referred to have a scs and went through the psych eval for this. I was told that as the procedure was very expensive they have to make sure that you have the right mindset to undergo the procedure and that you're happy to have this type of device implanted. It's nothing to worry about, just be yourself and answer the questions, also ask any questions that are bothering you, as this will also show your willingness to undergo the procedure. In the end I have had the newer drg stimulator fitted and am currently 1 week after implantation and have got excellent results so far, it's up there with sliced bread as the best thing available. The difference between scs and drg is that with drg they can target very specific areas. I'd be glad to hear how you got on with your scs.