I was told to use ice before I was diagnosed with having RSD and it made me a lot worse. We used the spray ice cans that you can get (like an ice cold mist) and even that, caused my leg to hurt a lot more. Each time I used it, I got more pain and more spasms and colour changes so I had to stop using it. It was only when I was diagnosed with RSD when we found out that you shouldn't use it - my PM Doctor said he knew as soon as I was diagnosed that ice had had to have been involved and that you shouldn't use it as it can aggrivate the nerves even more.
Here's a link that we were given about the use of ice in RSD that you may find useful:
http://www.rsdrx.com/rsdpuz4.0/puz_102.htm
I guess everyone is different though and no two people react the same. For me though, it was a bad decision.
Best wishes!