Take a look at this article:
http://www.jpeds.com/article/S0022-3476(99)70173-3/abstract
Unfortunately, without journal access through a university/medical library, the full text costs $$, but google scholar caught this glimpse from it:
"Several recent investigations have also identified
a high prevalence of orthostatic intolerance among those with fibromyalgia. ... "
so it does link CFS, EDS, OI, and fibromyalgia (and is by Rowe).