According to the history provided here, it looks most likely a cervical pain that is due to intervertebral disc prolapse ( more commonly knows as slip disc) over the neck which is pressing upon the sensory nerve of the upper arm(it originates through the neck and courses through the upper arm), and hence causing the pain. By taking the appropriate prescribed medications only, there would be not a complete relief from the same as the medication will only relief the spasm of the muscle and decrease the inflammation of the surrounding soft tissues and hence relieve the pain temporarily. For a better control of the pain, you should also include certain exercises in the regime that strengthen the muscles around and relief the pain. Also adding the medication for the nerve regeneration, will make sure the damaged part of the nerve is repaired well. Since there is a muscle spasm and a nerve involvement , the neck being a really important and delicate structure, should be given a proper immobilization(rest) in a hard cervical collar so as to aid in the healing. You can always consult in case of any further issues or clarifications.

Orthopaedic doctor need to address your prblm. And it's been a month pain is still same and it radiates to arms . Their can be two possibilities it can be either shoulder muscle prblm or neck prblm (cervical ) Get your self examined in detailed by Orthopaedic doctor and after that MRI  will be required.either for cervical spine or shoulder.

Pain starts from neck radiates to arm and hand? Any history of abnormal sensations like numbness or tingling or weakness in hand? Any history of diabetes or thyroid disease? He needs detailed evaluation for his correct diagnosis for proper treatment .kindly get connected with me on Practo chat for further detailed discussions

It's a pure ORTHOSPINE problem CERVICAL SPONDYLOSIS U NEED TO CONSULT WITH ME DIRECTLY THROUGH PRACTO FOR COMPLETE DISCUSSION ON THIS .....! DR .SANDEEP SARAF AGARWAL