I was in a similar situation two weeks past, I rear-ended a car (who had stopped in a stupid place!) and wiped myself out on the road. Was very skittish about getting on the bike again, convinced that I'd been lucky once and that I may have run out of luck for the next crash. I cycled round my local park for an hour or so, convinced myself that I *was* a good cyclist and then progressed to wee side roads with little traffic. Now I'm back to my old commute-every-day-shouting-at-bus-drivers-and-nattering-to-other-cyclists-at-lights self!
Get right on with it, I procrastinated for days!

Kal