I had one client, back in the middle 80's, that suffered from RSD. The treatment prosed was painful but reliable. Steroids, treatment with a type of physical therapy where his hand and arm were placed in an enclosed device, bombarded with tiny piece of corn cobs and warm air, as well as physical therapy with active and passive range of motion. It was extremely painful, at first but was successful in the treatment. It has to be done within a relatively short period of time from diagnoses.