How To Test If There Is A Concussion Or Not?

Hey, today i was hit on the head at school with a backpack. Wasnt to hard and didnt hurt imediatly but when i got home i have had the worst headaches, they really hurt. Sort of like migranes, they are horrible. Also i slept about 3hours when i got home and woke up and the same headache came back soon enough. I have been laying down awake for hours but when i got up my vission was really blurry. I feel tired but i dont want to go to sleep because i read on the internetyou can go into a colma if sleeping with a concussion. Also it is late and everyone in the house is sleeping. I dont eant to wake anyone and im afraid to sleep. What should i do and how can i test if i have a concussion? Should i eat or drink anything specific? Please help im real worried