I'd just like to toss ot the info on c1/c2 (atlas /axis cervical adjustments}
info-
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

Also possible is thoracic outlet syndrome {TOS} if you hit your head/shoulder/neck /collar bone.
Our TOS forum
http://neurotalk.psychcentral.com/forum24.html
useful stickys
http://neurotalk.psychcentral.com/thread84.html