Thanks all! I really should've asked the driver's info, but I didn't. Anyway, my (helmeted) head never hit the ground, and it seems unlikely there's any further issues. I think I can find her if needed, this was in a small village.
I've had harder falls riding by myself, but what shocked me in this case was I felt helpless - just riding along, a car turns and suddenly hits me.
Guess I have to be more careful in the future, always brake for cars that could have even the slightest chance to hit me. This I could have avoided if I didn't assume that the driver had seen me and would brake. Instead, she went along and only braked at the last second.