[Sorry, this doesn't have much info. Apologies if this has been highlighted already somewhere or is not that relevant - I can't see the full paper so can't check what is being talked about, nor am I up-to-date enough to make a good guess. But I'm guessing what is said in the paper could be relevant to ME/CFS and/or others with what are sometimes called "medically unexplained illnesses".]
What's so special about conversion disorder? A problem and a proposal for diagnostic classification.
RA Kanaan, A Carson, SC Wessely, TR Nicholson, S Aybek, and AS David
The British Journal of Psychiatry, June 1, 2010; 196(6): 427-8.
Conversion disorder presents a problem for the revisions of DSM-IV and ICD-10, for reasons that are informative about the difficulties of psychiatric classification more generally. Giving up criteria based on psychological aetiology may be a painful sacrifice but it is still the right thing to do.