I have been taking Valium for over a year now for muscles spasms associated with my RSD. I have just recently had to increase my dosage, but only because my RSD spread after having a SCS implanted, and all the complications that arouse. I haven't noticed any adverse side effect from the Valium. The few times I have gone off all my meds to fee the "true pain", and give my body a break, Valium was always the easiest for me to stop taking.
I also take Magnesium daily. Finest Natural 250mg x 2 daily. My surgeon said you can't take too much magnesium esp. for RSD patients, and esp. after any sort of procedure.
I wish you the best of luck. For me if its working, don't mess with it