Just to clarify, although ME is treated by using CBT, the CBT is not to treat the CFS t is used to treat the co-morbid anxiety or depression. I think when things get reported in the press this angle gets missed out.
Many HCPs don't believe CFS to be psychological, though frighteningly there are those that do (some of my colleagues). I am a therapist, I treat patients with CFS using CBT, person-centred counselling and pacing. I also have CFS, triggered by 2 recurrent bouts of glandular fever in my teens.
The problem with the psychological angle is that research = money. The psychiatric quarter has fought tooth and nail to maintain that it is a psychological illness. There is actually precious little evidence tha it is psychological in origin except that no one can find the precise physical cause. It is similar to hypothyroidism, adrenal burnout and Gulf War Syndrome though, all of which have some measurable physical attribute.
The XMRV debacle was crushingly disappointing to many suferers. It may also have put paid to more research being done in this area. Pharmacology = big bucks and they will fight to keep the money.
Having experienced depression, chronic pain, long term disorders and CFS, as well as being a therapist, personally I can say that it is unlikely imo to be psychological in origin. My CFS acts exacly like the post-viral syndrome I had after I had glandular fever - perfectly well recognised by doctors. It just never went away.