Thrown Fork

I was making my autistic son eat his carrots when he got angry and threw his fork at me - I used my right arm as a sheild and it was pierced by the prongs - my arm is now, 45min later aching and my fingers are a bit tingly, I can't lift anything with that arm. Why does it hurt so much?
Lelta Lelta
22-25
Dec 1, 2012