You may have cervical spond
Please you use thin pillow which should be firm not very soft or hard.
Pain killer don't effect much in severe spasm . you should take more local treatment on the affected area. Go to good physio ,they will give you some stretching exs .some modalities to relive pain and increase blood circulation.
Next Steps
Visit a good physio
Health Tips
Dont do forward neck bending .
keep changing postures.