Postural Correction- Sit Tall, Walk Tall. Extension Exercises x 15 times x twice daily - lying on tummy, take left arm up for 3 seconds, then bring it down, right arm up for 3 seconds, bring down. Bring right leg up, hold for 3 seconds, bring it down. Then right leg up and hold for 3 seconds and bring it down. Repeat twice a day- 10 times. Bhujang Asana – Lie flat on your stomach, keeping the palms out, bend the neck backward, take a deep breath and while holding it for 6 seconds, raise the chest up. Release breath and relax your body. Repeat the exercise 15 times twice daily. Core Strengthening Exercises- Straight Leg Raised With Toes Turned Outward, repeat 10 times, twice a day. Back Stretching- lie flat, pull one of the knee forward to chest, hold for 3 seconds, then bring the other knee forward to the chest and again hold for 3 seconds. Then pull both knees towards the chest and hold for 3 seconds. Repeat 10 times each exercise twice a day. Do the cat/cow stretch. Get on all fours, with your arms straight and your hands directly under your shoulders; your knees hip-width apart.

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It might just be a muscle spasm around the neck also called as wry neck due to improper lying posture or sleeping with head turned to one side

Hello there...you seem to be suffering from an acute case of neck/trapezius spasm ... it could well be possible that a nerve irritation might have occoured.