What a story! Reminds me of the time we took out kids to Disneyland. My eight-year old son developed a huge sore on his back. He didn't complain so we didn't take him to a doctor until we arrived home in Australia. He had shingles so there was nothing we could have done. That made me feel better, but I still felt like a bad mum. So pleased your son was ok- always best to get head injuries checked.