Can anyone out there please explain how the hyperbaric oxygen chambers help people with RSD I've had it since 1986 and the first I've heard of it was when I found this website. I have a great Dr. down here in Fl. and have seen Dr. Schwartzman in Philly, none of my Dr.'s have ever mentioned it , they have talked to me about the pump, DCS and other ways of treating the RSD,but nothing about the chamber. They told me the RSD is full body, inside and out I've had hundreds of nerve blocks ,3 sympathectomies, TOS and just about everything else, to a point that my neurologist told me I am to be palliative care only,nothing invasive. Well the chamber is not invasive. How does it work? And does it work or help? Thanks for any responses in advance. I look forward to hearing all about it. Still in pain. Wendy