I have Crohn's but not CFS. Although I do not think the two are totally unrelated. Crohn's has a dysfunctional immune system behind it, and a pathogen may be responsible for this. I am sure you can pick up any other number of pathogens as a result.
I did treat myself for the XMRV virus using an unapproved, experimental treatment method, and did respond to it in a strange way. My intestinal tract got sore while treating the first time, and when I had treated for it several times that went away, but my intestinal function was noticeably faster. In another words, I went to the bathroom more often.
I did not notice any other benefit, or any other effect from the treatment.
I have never used any standard treatment for my disease. I am pretty much 100% 99% of the time.
Dan