My Stomach Hurts ALOT ! Whts Wrong?

Usually My stomach hurts ALOT!Mostly at school ! Any Idea's whts wrong w. Me????
I feel REALLY sick and have to go home, then i feel better!
Update: I'm 13, and Ive been bullied A LOT! (teased, Called FATT, etc.) Just in case that would have anything to do w. it
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