All of the issues noted in this thread as causative factors in these evasive diseases are in fact true, but I do also wonder about things that we may have been exposed to in the past. I wonder about some of the vaccinations I was given as a child (at a Naval hospital), or in a line-up in the auditorium of my grade school in the 1960's.

It may sound paranoid, but can we really know for certain what we have been exposed to? Remember the MK-ULTRA program? One experiment in 1966 subjected masses of people in the New York Subway system... This is but one of a slew of biological experiments that used the general population unknowingly and without consent. Some have been unclassified, such as the NYC subway experiment, though I wonder how many other classified experiments there are right now. Agent orange exposure or Gulf War Syndrome create terrible illness. GWS has a symptom profile much like FMS/CFS and SFN...

http://en.wikipedia.org/wiki/Project_MKULTRA

Just a slightly different angle on things..

Mere