I keep recreating the scenario at the spot of the event to calm me down by reassuring myself that it would've been very unlikely for my head to hit. I still want a little help on this one though. What I'm meaning to ask is that if there is an impact to any body part (shoulders against wall), do our neck muscles automatically stiffen up so that our heads don't move a whole lot? If I did use my neck muscles it would've been pretty much impossible for my head to hit the wall since my shoulders are pretty wide.

I know that this is seeking reassurance and for some reason it's considered bad for fighting anxiety, but I really need to calm down asap so all responses are appreciated.