I feel like it is very likely to have a concussion after that smack to the back of the head because of the fact that I started to feel "symptoms" as soon as I stepped out of the vehicle, these symptoms include: weakness or lack of coordination in my arms and legs, lightheadedness, anxiety, and hard to focus. What I don't understand is that smell that occurs when you get smacked in the head, that lasts only the second you are smacked, and vanishes afterwords. Any ideas on this?