Hi welcome and sorry about your pain. I researched HBOT cause I was going to do it but did not end up just cause I felt it was not going to do much but everyone is different. Do you take baths? I find them helpful and some find epsom salt baths helpful. I also take magnesium supplements which I guess is supposed to help with cramping and have started taking more omega 3 and my pain doctor suggested vitamin c. In terms of meds I don't take any as needed but was on for awhile neurontin etc and klonopin I tried to help relax the muscles etc. Have you looked into meds like that? What about pool therapy? Are you under the care of a specialist for rsd?
Sorry I can't offer more. Hope you get relief