here's a list of sites with info -
Fibromyalgia links-
http://www2.rpa.net/~lrandall/index.html
http://www2.muhealth.org/~fibro/fm-md.html
http://www.nfra.net/Diagnost.htm
http://www.fibrohugs.com/
http://www.fmnetnews.com/pages/basics.html
http://hometown.aol.com/fibroworld/index.htm
http://members.aol.com/fibroworld/FMfact.htm
http://home.mn.rr.com/apbiii/fibro-links.html
http://www3.sympatico.ca/jfroache/fms2.html
http://www.sciencedaily.com/release...20607073056.htm
http://fmaware.org/
http://www.mwilliamson.com/info.htm
http://www.emedicine.com/med/topic790.htm
http://www.emedicine.com/pmr/topic47.htm

there are many similarities but some definite differences that make each stand out.

FMS has extreme fatigue and the specific tender point locations.
one of those links will show/tell the locations of those.
It's been awhile since I did all the reading on those sites.

It is possible to have both as well as other close conditions.