My doctor told me once you have CRPS you always have it. It may go into remission, but it can return at anytime, with or without a trigger. I thought I had "beaten" it, but I was wrong, as soon as I over-challenged my CRPS limb I had multiple flares and a resurgence of electrical shocks and sensitivity. Fortunately, with exercise and pool work I am back to improving.

That said, my thought is he might want to try taking Low Dose Naltrexone and getting into a warm pool to exercise his limb asap.

Is the temp of the foot cold or hot?