Shocking news James, really sorry to hear this. Having spent 3 months in a hospital bed due to a r.t.c. (many years ago) I can only advise that you need to switch your mind into a different mode. All the things that were important before Sunday, actually aren't really important at all.
The only thing that's important now is to try to relax into a prolonged period of bedrest, find whatever suits you best to occupy your time, accept that's how things will be for a while, and allow yourself to be selfish and concentrate on your physical and emotional wellbeing.
It takes time to get over the trauma, theres no way round that. I used to lie awake at night for at least a couple of years trying to remember the actual impact. It seemed desperately important at the time, but of course as time goes on the minor details become pretty unimportant altogether. You realise just how fortunate you have actually been to survive and carry on with life, when so many others don't.
Hope your recover is a complete and speedy one.