You need to visit a physiotherapist.. But you can get an MRI done first.

Neck Exercises. Neck Stretching. Postural Correction. Shoulder Shrugs. Take frequent Breaks at work. Core Strengthening Exercises. Use cervical pillow. Use Back Support. Self Massage the back of neck.

The could be arising from wear and tear of the neck vertebrae or incorrect posture or from weaker muscles. You need to see a Spinal Surgeon for assessment and investigations as appropriate. If there are no concerning features then physiotherapy, painkillers and hot fomentation will help. Hope this helps. Dr Vinu Raj Consultant Spine Surgeon MBBS MRCS FRCS(Trauma&Orth)

You need to take muscle relaxant also.  For some time