Thanks for posting your query.
It might be due to pinched nerve
at cervical region.
I suggest you to consult an orthopaedician nearby for a detailed examination. You may get the X-ray/ MRI
of the area affected under his/her guidance.
Meanwhile you can take non-steroidal anti-inflammatory drugs (NSAIDs) to reduce inflammation and painand muscle relaxants to calm spasm.
Dr Saurabh Gupta