National Eosinophilia-Myalgia Syndrome Network
http://www.nemsn.org/

Found this on WebMD:
http://www.webmd.com/a-to-z-guides/eosinophilia-myalgia

"Eosinophilia Myalgia Syndrome is associated with the ingestion of large amounts of contaminated L-tryptophan, a dietary supplement often sold in health food stores. The contaminant remains unknown. It is a disease of abrupt onset causing severe, disabling, chronic muscle pain, skin symptoms and other neurotoxic reactions . Diagnosis is not easy and depends on finding unusually high levels of eosinophils (circulating white blood cells) over a period of at least six months."


EOSINOPHILIA-MYALGIA SYNDROME
http://www.eosinophilia-myalgia.net/