I've found The Sedona Method of "letting go" helpful in dealing with my stress and anxiety about feeling ill for so long. I use it on and off on a daily basis, especially when I feel myself getting anxious about things not being the way that I want them to be. What we resist persists, and I definitely maximise my suffering when I focus on how things aren't the way I'd like them to be. Resisting causes stress, and stress compromises our immune system. So whether CFS turns out to be purely stress-related or due to some infectious agent or immune system problem, dealing with the stress and emotional stuff that illness brings up is bound to help.
Check out this video from the author of The Sedona Method talking about how we aren't our diagnosis: