As mentioned...immobilization is not a good idea with RSD. Something that might help would be some sort of heat wrap to help with the pain...or maybe a Lidoderm patch or something like that. What I do when it's bad in my arms is put on a heat patch or Lidoderm patch and then lightly wrap self-stick first aid tape around them (tape that does not stick to skin but sticks to itself). That helps when I need to use my arm but it's in pain...unless it's a REALLY bad flare and then nothing but a nice soak in hot water and Epsom salts helps.