I have a question about the chamber. Do you find relief the first time in the chamber or is it several times before relief is felt? Also, can anyone give a comparison using the chamber versus ketamine infusions? What I gather from reading this thread is the duration of RSD pain relief the chamber gives is approximately the same as what ketamine infusions give to most RSD sufferers. Also, the chamber may give relief to those who've had RSD for several years where as ketamine may not?