CFS is very strongly associated with toxic mold exposure, and will go away when the person manages to get out of their mold-infested environment. Please note that mold is often not visible and may have no odor. I had a pipe leak inside a wall and almost died before someone clued me in (NOT a doctor, they know nothing about mold toxic illness) and I got out. If getting rid of the parasites did not in fact cure your CFS, take a look at toxic mold.