Please Only answer if you have finished a course of HBOT or COMPLETED a significantly large number of 20-40 treatments. Feeling better or worse after just 1-10 sessions does NOT count and will skew the results. I have put in an option for people who have worsened so much that they had to drop out. I am considering trying this treatment and the results would be very helpful for me and others who want to try HBOT, considering how little research there is. The only specific CFS study was an uncontrolled Turkish study for only 13 patients. This involved just 15 treatments. There was an Israeli study on 60 patients with fibromyalgia, but I was told by the head doctor of the research that he did not exclude CFS as a secondary diagnosis. This involved 40 treatments.