So I've read on here that you can't really suffer a head injury unless you hit another vehicle or are shaken violently.
But what if the driver turns to the left and then to the right really really quickly?

I'm asking because my dad was just driving me home and there was a car coming from the lane next to us and wanted to get in our lane. I guess my dad didn't really see him coming or the other guy was driving too fast but my dad turned the wheel to the left and then to the right really fast to avoid hitting him. This caused my head (and neck) to be shaken quite a bit since I wasn't prepared for it.

Of course I'm dizzy and have a headache now so I'm hoping it's just my neck acting up and not another concussion?