It might benefit you to read about thoracic outlet syndrome (TOS), it can happen after a shoulder/neck/ upper body injury..

The useful stickys on our TOS forum would be a good place to start, you might find more related symptoms to what you are having..
http://neurotalk.psychcentral.com/thread84.html
http://neurotalk.psychcentral.com/thread125577.html
http://neurotalk.psychcentral.com/thread135.html

and the main TOS page -
http://neurotalk.psychcentral.com/forum24.html