Hypocondria???? HELP HELP PLEASE?

hey! so i've felt like this since this monday when i searched up some stuff about 2012 (the world ends, fake **** but i cant stop thinking about it) and the swine flu. so now it feels like i have all the diseases and disorders in the world and that i'm gonna die soon. my stomach hurts all time because of my worrying and i can't eat anymore. what should i do? it's feels like i'm lost all i'm doing is worrying CONSTANTLY. i'm 14 but i feel so old like my life is over. i'm googling all types of illnesses and diseases 24 / 7. i hate this!!!!!!!!!!!!!!! :( and i'm crying all the time. what should i do? PLEASE PLEASE I AM BEGGING YOU HELP