Friday morning, I was getting ready to take a shower. Due to my clumsy nature, I ran into the door frame on the left side (my left) of my head. It hurt for a few seconds, but afterward, I was fine and jumped into the shower. I didn't pass out, I wasn't dizzy, no nausea, etc. I've looked up symptoms of concussions quite a few times as I am a big worrier, and the only one I'm really experiencing is a headache, although it isn't severe.