I can understand your concern.
I would suggest you get a mri done and consult a orthopedician.
We need a detailed history.
Is there any pain at the shoulder joint?
As of now you can take a tab. Myospaz-th twice a day after food for 3 days.
Apply diclogel over the affected area and consult a orthopedician in person for further evaluation and management.
Dr. Anil kumar jain.
1.Tab Pan 40 mg twice daily before meals.
2.Tab Zerodol-TH twice daily after meals.
3.Tab Vertin 16 mg thrice daily after meals
4.Tab Gabaneuron 100 once daily after dinner.
5.Arachitol Nano once weekly.
6.Tab Maxical Plus once daily after meals.
7.Cervical Static Exercises.
8.Ibusgesic Nano Gel for local application.
9.Tab Perinorm 10 mg as needed for Nausea and Vomiting.
10. Maintain good posture while working , sitting or walking .
11. Avoid using Pillow . Use Ortho mattresses.
12. Don't lift heavy objects . Don't bend.
The neck pain with radiation to Arm may be due to nerve root compression. The causes may be disc prolapse, facet joint hypertrophy, any other structures. So clinical evaluation of the compression status along with radiological investigations will defenetly pinpoint the problem. Depending on the casuse treatment maybe drugs / interventions/ surgery.