This treatment is being suggested on bases of the information provided. However I would like to examine & investigate you  in detail. -Control  Hypertension, Diabetes or any other metabolic disorder, if there is any. -Any way it may be tried, --. Dolokind Plus (Mankind) [Aceclofenac100 mg +Paracetamol 350 mg] 1 tab. OD & SOS. X 5 days. --. Caldikind plus  (Mankind) 1 tab OD x 10 days. -(You may need help of your local doctor to get these medicines.) --. Fomentation with warm water. Let the part not be exposed to cold. --. Sleep on a hard bed with soft bedding. --. Use no pillow under the head. --. Avoid painful acts & activities. -- .Do mild exercises for the affected part. --.(Take help of physiotherapist or you can visit my you tube channel nc gupta me and my yoga). --Do not ignore, let it not become beginning of a major problem. --Do ask for a detailed treatment plan. Kindly make sure, there is no allergy to any of these medicines. --For emergency treatment visit nearest hospital. --Wish you a quick recovery & good health. --I hope, I have solved your problem to your satisfaction.  Dr N C Gupta MS (ortho)

It could be disc prolapse at the cervicle spine. If putting hand above the head reduce the pain on the concerned side, meet an orthopaedician as early as possible. I can help if I know the other expected symptoms as well

Mainly it is due to muscle weakness in neck. Physio in form of IFT and usg massage might help. Do neck muscle strengthening exercises once pain settles. Drink plenty of water to avoid dehydration because dehydrated disc is more prone to injury or buldge. Consult orthopaedic dr.