It seems only mechanical pain
U need rest and medicine. (Muscle relaxant)
Gel ...to b applied gently
Physiotherapy will also help.
Next Steps
try above things. if not.better get and x ray of neck done ....that is. x ray cervical spine ap and lateral views
Health Tips
avoid continuous work,work with head down position. avoid pillow. u can have hot fomentation with heating pad or hot water bag