When I was hit last October, I had to call my wife from the hospital for a ride home and there was no hiding a broken clavicle and totaled bike. Personally, I would not keep it from my wife if I were in your position. What I would do before telling her, however, is determine why you got hit. Though it was the driver's fault, there were probably things you could have done to make getting hit less likely. Concentrate on those to show you are taking the risks seriously. For me, I upgraded my lighting and added lots of high-vis to my commuting wardrobe. Good luck and glad you weren't seriously hurt.