Welcome to Ask The Doctor.
You seem to be suffering from Severe Muscular Spasm.
I would advise you to get a X-ray Cervical spine to rule out any disc prolapse.
For muscular pain i advise following:
1. A combination of pain killer and muscle relaxant containing Diclofenac and Thiocholchiside.
2. To do hot fomentation of the affected area.
3. To apply Diclofenac ointment locally.
4. To get physiotherapy done particularly Ultrasonic heat massage.
Your pain would start getting better in 5 days.
I hope it helps.
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