I was walking through a sliding door and did not realize it was closing instead of opening so the metal sliding door banged into the side of my shoulder very hard since I basically walked right into it. The force kind of knocked me back and jolted my body backwards. I could feel the impact vibrate to my head and the force of it made my teeth chatter together ( I think this is because my mouth was open so something about the impact pushed my teeth to clamp down on eachother).

Could this force have caused a concussion?