See the link below regarding ice and even contrast baths with RSD/CRPS. Ice is bad for RSD/CRPS, period.

From rsdhope.org:
"Ice will also cause the blood vessels to constrict more, reducing the blood flow to the extremities, increasing the pain, causing color changes, etc. but the real damage is to the nerve's myelin sheath; basically, the protective cover for the nerve."

http://www.rsdhope.org/ice-and-crps.html