I should be brain dead

I’ve been told this but I dont actually remember it. Yesterday during my basketball practice I went up for a rebound. I was told on the way down one of my shoes popped off and I fell and smacked the ground head first. I was rushed to the hospital and given many tests like an MRI. Well this morning I woke up with a massive headache, and I dont remember what went on yesterday. I’m extremely lucky. So…