I started taking gabapentin (neurontin) after I had RSD for a couple years and it worked remarkably well. The first several days I was extremely sleepy but this went away by about the fifth day. It simply eliminated my pain almost altogether. It didn't help the other symptom a great deal and didn't give me back use of my hand but it made it much easier to avoid the triggers and avoid most of the pain.

I weaned myself off of it over a year and my condition gradually improved for a while until I had another major setback. The second time the gabapentin was less effective and I've had to increase the dosage quite a bit.

Good luck.