Thank you for the information,
There are some common causes of such neck pain.The common ones are unstable angina, myocardial ischaemia, nerve irritation, cervical disc pathology, muscle strain, etc.
As per the symptoms described by you, the chances of cardiac cause should be ruled out first which may cause such pain radiating to neck, jaw.The decreased blood supply as in unstable angina or myocardial ischaemia may cause such symptoms.
The other possibility could be the nerve irritation due to cervical pathology which may also be associated with such pain in this region.
You should have the relevant investigations done like ekg, 2d echo of heart, ct scan neck after consulting your doctor to know the associated pathology.
The treatment depends on the underlying cause.
Let me know if you have any doubt.