I've had two incidents of being knocked of my bike. Only minor scrapes to me, but some damage to the bikes.
I dealt with both parties direct. One was a company van, and after getting quotes for the damage and repairs the company paid up with no fuss.
The second, the driver did the the same, actually coming to my residence to pay up.
Maybe I was lucky in the respect that both drivers stopped, and admitted liability, I was on a main road, they were coming out of side roads and somehow didn't see me.
You just need to keep calm, if possible, and get things in order.