WhatamIdoing; Da Costa’s syndrome has been described as being related to CFS since the Da Costa’s syndrome article page was started on 15-5-2006 here , 15 months before I started adding to it. 

Also the following quote . . . “The orthostatic intolerance observed by Da Costa has since also been found in patients diagnosed with chronic fatigue syndrome and mitral valve prolapse syndrome.[11]” is from the current page here , where it has been moved from the “Related to” section at the end of the page, up into the “Diagnosis” section where the CDC hypotension that I have just been discussing is referred to as being involved in the diagnosis of Da Costa’s syndrome and CFS. I did not put that comment there, and I did not put the reference number 11 which supports it there. You probably did, or at the very least you didn’t remove it as being wrong, so I don’t have to convince you of something that you already know and accept.

If you want any more links to CFS and the synonyms of Da Costa’s history you can find nine references that I have provided on the subpage here 

Also Avnjay has not given me any indication of changing his mind, and in fact, has done an excellent job of rewording the introduction, and the history of the topic from 1864 to 1900, without me having to change anything  posturewriter