Hi Doc, I Had A VP Shunt Put In When

Hi Doc, I had a VP Shunt put in when I was only 1 day old and only had to have it reconnected when I was 13 or 14. I recently got hit in my head on the exact spot where the shunt goes into the brain, and now I feel a needle-pricking type pain on my neck, behind my head behind my left ear. There is no fever, headache or pain anywhere else. The pain usually goes away when I take Tylenol but comes back when the pain killer's relief dies down. What is going on with me, Doc?