For this condition you need proper assessment. As per your wording there is any compression on nerve root so the pain radiating downward to hand and back. First of all you go for a proper assessment for causes of pain.
Next Steps
Consult your nearby experienced physiotherapist or orthopaedician.
Health Tips
Use hot pack on neck and back to relieve pressure and for relax.
Avoid pillow and use small roll of towel under the neck.
Avoid forward bending and weight lifting,
Do flexion regimen of exercises, and isometric exercises of neck,