A friend of mine hit his head pretty hard on the bottom of a garage door a couple days ago. He said his symptoms were: Not being able to concentrate Easily , Headache, Fuzzy vision like if your in a dream cloudy , Sensitivity to light, Feeling tired, I sat back down and 5 min later I’m nodding out , Easily upset or angered like I haven’t eat any thing all day but I have Could this be a concussion?