I don't know if you have seen other post mentioning upper cervical chiropractic care?

With any hit to the head or shoulders/upper body { those can also affect the 2 top cervical vertebra because of the weight of the head}
- MDs usually don't suggest chiropractic or even upper cervical care - must be a stigma or something...

But it just might be helpful, if you read about it it makes sense.
this site is a good starting place to learn about it - it is different from regular chiropractic adjustments if you are concerned about that part of it.

http://www.upcspine.com/

signs/symptoms - http://www.upcspine.com/self.htm

You may also read on our Thoracic outlet syndrome {TOS} forum if arms/hands, neck & upper back are having pain.