Paul.
I know EXACTLY how you feel. My pain doc also recently put me on Cymbalta, and it has helped with the emotional aspects a great deal, and has been shown in studies to help with nerve pain so you may get an added bonus of helping relieve some of your RSD pain taking it.
My husband is still so perplexed when I my pain is at it's worst, I can't just lay down. He always says lay down so your body can rest, but it just feels like torture to have to LAY there and just FEEL nothing but pain. As you said, your brain is just already in overdrive from the pain, trying to relax in that state, at least for me is near impossible. The Cymbalta is def. helping with that feeling, but not a complete solution.
I wish you the best of luck. Let us know how you are doing.