Hello there... I understand your concern... There are many possible reasons for your pain which has to be taken care....it may be due to Abnormalities in the bone or joints,trauma,poor posture,degenerative diseases,muscle strain,shoulder joint instability,dislocation...you may require investigations like x ray,MRI etc...Consult nearest orthopedic surgeon they will do the needful.

Hello....... Warm compression, neck exercise and rest should subside neck pain in few hours.. If you are having persistent pain root cause should be identified.. Lower height of your pillow.. Sleep in supine position, consult orthopedic surgeon if pain doesn't subside.