Working continuously by sitting in front of your laptop can be the reason for your ache and discomfort. If your left hand is also being effected with it , it can be cervical spondilitis. This occurs due to wrong posture. To get rid of this problem, you have to correct your posture that this problem may not increase. You can use hot water bag twice or thrice a day at the effected area. Stop using pillow. Lay on plane surface. You can use cervical pillow if you can't sleep without pillow. The exercise you can apply yourself is just put your head hanging from your hard bed and touch your chin for 10 times at a time to your chest. Soft shoulder massage will be effective. And you can wear cervical collar too while working in front of your laptop.
Next Steps
if this doesn't work then you may go for the cervical x ray. and consult a near by physio.
Health Tips
wear cervical collar and apply hot water bag to the effected area. in case of severe pain, you can have aceclofenac tab.