Hello, I'm assuming he hit his head?
Have you read about the c1/c2 or atlas and axis on any chiropractic sites?
I'm not sure this is the case for your friend but something to check into.
some chiro links-
Chiropractic care info- a good one can help with many symptoms:
http://www.upcspine.com/self.htm
http://www.uppercervical.org/subpag...b/about_faq.php
http://www.spineuniverse.com/index.html
http://www.coloradochiropractic.org/.../glossary.html

If you decide to try it see an expert DC.