Don, Yes, it is a good idea to have it checked.  I broke a vertebrae one time and did not know it, except for some back pain.  Found out later, after it healed.  I was lucky.  The back of the head is very delicate.  Roller skated recently on ship, and I fell once.  Gave me some sore ribs.  They made everyone wear protective equipment, and there were no walls.  When I fell, I heard my helmet hit the floor.  Thank goodness I had it.  I'm 72.