I first heard about Morgellons about 4 years ago. We discussed it one day during a regional herbalist meeting. The consensus was that it was caused by Genetically-Modified-Organisms crops, particularly the Roundup ready soy and corn crops. If you do a google search of the 2 together, it will give you a completely different grouping of websites for further information.
The subject came up when a client came to one of the herbalist's shops for help but she never came back with an update so I'm not sure what became of her. I believe she had many of those symptoms you listed, but the most intriguing symptom was the skin breakouts with unidentified fibers.