Erf! That sounds like a really nasty crash. I'm glad you're okay though. A friend of mine crashed in a race when the rider in front of him went down. He said he lost part of his memory because all he could remember was one minute grabbing for the brakes and then the next minute sitting on the ground with a bunch of people around him. He was also surprised to discover the sounds of an ambulance siren and later confessed to me that at the time thought to himself, "wow... there sure are a lot of paramedics coming my way, someone here must be hurt pretty bad..." before blacking out again. He didn't realise at the time that the ambulance was for him. He recovered fully except for the memory of the actual crash. Anyways, good luck and I hope you have a speedy recovery.