Yesterday, I slipped and hit my tailbone on a rock at the lake, then grew very weak and lost consciousness. I was unconscious for about a minute, then slowly came back unable to see for about 10 minutes. I had had a meal probably 5 hours prior to this, biscuits and gravy with a cup of coffee, then drank 2 beers roughly 2 hours prior to the incident. I didn t feel hungry, tired or thirsty at all when the incident occurred. What could cause something like this to happen?