My C2-C3 is compressed and it has pinched off the greater occipital nerve that junctions at C2-C3. The occipital nerve runs from the base of the skull to the top of the head and terminates at the top of the head--right side.
The pain is localised to about a twoonie size area (for me anyway) in that area and feels like a screwdriver is stuck in the top of the head. Imagine pulling your hair as tight as you can that's sort of what it feels like. It can wrap around under the right eye (they call that a ram's horn). The pain can be aggravated by brushing your hair, wind, etc. The surface of the scalp is super sensitive. They use nerve medications, nerve blocks and burning of the nerve to treat the condition.
It's the worst pain I have ever had, that's for sure!...
hope that gives you some info..
What condition do you have, may I ask?
Julie