This occurs usually due to an acute facet joint(locked joint) movement restriction and associated intervertebral disc derangement( a mild bulge in the disc of your neck).if you had any injury to your neck you should proceed only after taking an x-ray and u have to rule out any fracture or dislocation.if not then you can continue with the following treatment

Hi Sprain in neck from two weeks is a sign that your neck muacles are getting extra load/ pressure. We need to take care of our neck posture to relieve stress over those muscles. Initially fr few days can start with hot water bag for 10 mins. Than start sitting erect while doing your work like while using your mobiles, reading etc. It should take two three days to subside pain gradually. Start doing some simple chin tuck exercises and mild neck strengthening exercises next week . It should work for you. Regards

Hi you can try with Ice pack application , still physical examination is mandatory to Rule out Root cause.