Regarding things happening too quick to react.
Part of the learning to fall properly is teaching yourself to react quicker. Take for instance driving a stupidly fast (race) car, for a while the world goes by in a blur then as you're brain reacts to what is required and you become accustomed to what is required. It is just another skill like learning to balance.
This is all part of not sailing beyond you're skill level, if you don't think you can react when crashing at 35knots don't sail there. Despite the initial shock of what the flip just happened (which can stay with you for a while) you should be able to pick the exact moment of where it all went wrong, and you will know for next time.
Take for instance the world cup guys sailing at sotavento and fuerte years back going 40+ through breaking waves. There were many falls, heaps of busted sails and masts but all of sailors had learnt how to react appropriately. Despite a few sore necks and busted ribs they all lived to sail another day and didn't have to spend 4 months in neck braces.
On a seperate note who'd of thought all those years of gorilla's hanging off my neck kneeing the hell out of me at muay thai could have saved my neck. I thought it was doing the opposite