Mike, I also found this post, in searching old MedHelp articles. He doesn't seem to get completely clear answers, but the symptoms sound so much like your sons - hep a vaccine, then an onset that appeared to get better then much worse.
Prayers you find the answers you are looking for.
http://www.medhelp.org/forums/neuro/messages/33361.html
Thank you very much!!
We will investigate this.
Mike
oops, sorry, I spelled the condition wrong.
It's "macrophagic myofasciitis".
Poking around on the internet, I found this piece of research. I don't even know how to order the research, but it links vaccine adjuvants (catalysts) to macrophagic myofascitis, which is what it sounds like your son has.
I think you could probably obtain the article to learn more, or search those two terms. It sounds hopeful, that if this is what he has, it's treatable through steroids and/or antibiotics.
Best wishes. This sounds awful.
http://www.vhpb.org/files/html/Meetings_and_publications/Other_VHPB_documents/kiev-report-final12AV.pdf