some basic links to begin researching with.
START with the two last entries, Stars and DINET are the most user friendly sites I've found so far.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC506859/
http://askdrwiki.com/mediawiki/index.php?title=Neurocardiogenic_Syncope
http://www.mayoclinic.com/health/vasovagal-syncope/DS00806 (note how this page says that Vasovasal syndrome is harmless. blech, I have a word or two to say to them)
http://ndrf.org/ParoxymalAutonomicSyncope.htm
http://www.ecureme.com/emyhealth/data/neurocardiogenic_syncope.asp
http://www.stars.org.uk (excellent site for practical advice)
http://dinet.org/ (good information, good patient stories)