Damn, that's one hell of a wreck. If someone slams into you that hard in a place that takes away your control of the bars, like you described, you're just going along for the ride. Nothing you can do about it. So early in the race, too.
On the mental side, my advice is to take it one step at a time. First, regain strength and recover from the trauma. Next, get on the trainer. Next, think about when you can ride outside. With two broken wrists I'd suspect just riding is not going to be easy at first. Don't overdo it. Let pain be your guide and try and stay close to home. Racing can come later. For me the joy of riding outside again was a huge boost.
It's funny, I broke my collarbone on a track bike on the street practicing sprints.
Heal up.