Dull/Sharp Pain below my rib cage?

I woke up 2 hours ago with this massive dull pain in my lower rib cage/ upper right stomach. I haven't thrown up, nor do I feel nausiated. I have had bowel movements in thte past 24 hours, however I can't now.
I can't sleep, I tried putting a pillow under my stomach and it didn't work. I don't know what's going on. The only thing that I remember that could have hurt me was when I slipped on the bottom of some stairs at school. I think it may be appendicitis. Help!
sometimes I wake up at 1 am and eat something, but I don't feel like I want to eat, I didn't eat a whole lot yesterday either.
 
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