Do you think I...Could.. be.. INJURED!!?

Hi, i'm a tell what happened. I was in cl yesterday and I was sitting there doing nothing looking around until my clmate through graham crackers at me and landed on my pants. and THEY WERE SMASHED!! so i got up I threw them back and miss he threw the chalk board eraser at me and i threw it and i still misses. So i found this other full bag and smashed it up and then wait an half hour later till dismissal. And then i poured the bag all on his head and he has a fro. So I got punched in my upper back in the stairway running to get away and then I got punched HARD in my lower right back and it hurt. Then it started hurting and now it still hurts. When I bend or do any kind of twist movement it hurts. When i breathe it hurt sometimes. So what do you think? Could i be injured? I tell my mom to do stuff but she never do it. It was like months ago i asked for a frickin dentist appointment and I still ain't get it. I'm askin for a doctor appointment now and she just betta do it.