First of all, very sorry about the accident.... glad you have recovered. Whether or not you get back on the bike should depend on how comfortable you are with it, and are willing to risk the possibility of another accident. Sounds like you love the sport, so to me it would be worth it. We all assume some risk when we get on the bike. All we can do is try to be as safe as possible, including riding defensively in traffic. Occasionally an unavoidable tragedy like yours occurrs, which can be devastating. But it is also a tragedy to live in fear, especially when it stops you from doing what you love.
Good luck with your decision, your family, and your time at Bikeforums!