Hi, My Name Is Rebecca And I Fell Down The

Hi, my name is Rebecca and I fell down the stairs yesterday at school. The stairs are concrete and my right knee became swollen (about the size of a baseball) within 5 minutes of my fall and brusing has been getting worse on that knee (right) and that shin as well (right). Also, my left shin is bruised as well as my ankle. My left ankle also hurts a lot when I point my toes. What should I do? Is there anything seriously wrong?