I hope I'm not too late on giving you my thoughts on this, I was told to do contrast baths as part of my treatment in PT..DON'T DO IT! The pain I experienced during it was excruciating and a persistant one that no matter what was done for hours it lingered. Because I did them for over a month, my RSD went from being only in my foot/ankle to my hip and I attribute this one terrible piece of treatment to it spreading to my other leg. Ice and cold are one of the worst enemys I have encountered while dealing with this, and when you add one of those into the mix for us (people who suffer from RSD) the outcome can be detrimental to properly managing your symptoms. I hope this helps you!