I tripped over the school stairs and it swallon!(please answer)?

at school today i tripped over the stairs an my foot and i was going to cry but i didn't and its really hurting its swallon and i put some ice on it and it's not getting better and i dont know what to do could you please say what i might of done to it and what i can do to help it and i cant put any preasure on it could you please answer my foot allso bend forward