Many years ago I had all the symptoms of CFS but specifically in my case it turned out to be insulin resistance from eating a Standard American Diet for too long. Anecdotally I was able to eliminate all the symptoms of CFS by changing my environmental inputs but that was just my specific case and may not be helpful to you at all. I had to figure this out on my own but I should give some credit to all the research papers on nih.gov and a handful of nutritionists and scientists that gave talks on nutrition.