Is this a serious medical condition?

This rarely happened to me before, but lately, it's been happening a lot. What happens is, maybe I'm just walking, or I just swallow some saliva, or I just turn in my bed, and suddenly, I get this sort of severe shock on the left side of my neck. It feels a lot like someone picked up a small pebble, pulled their arm back as far as they could, and threw it at that one point on the left side of my neck. It's not only annoying, I also don't know if this is some symptom of a deadly disease. So, if you guys know anything about this, it'd be very helpful. Thanks.