Hi nw31705, I also experience cramping in both legs from toes to buttocks and you're right, it's just horrible. I'm only 9months into RSD, a week past my 2nd ketamine infusion and the cramping is back to how it all began after my initial injury. I can't put a heating pad on my feet or lower legs because that's where I'm burning, but I alternate it from my buttocks to the fronts and backs of my thighs and behind my knees to get a little relief. Also make sure you're well hydrated and get your calcium and magnesium levels checked. Definitely check in with your pain doctor. I pray the rest of your night is better. Blessings-Eileen