HELP! emergency! Fat girl=small clothes?

Ok I have been off school for snow and I have been trying to gain a bit a weight. I started at 108 and now I'm 146 and NOTHING will fit! I have SCHOOL tomorrow and NONE of my jeans button and my shirts show my belly! I can't use my moms clothes because she only weighs 110, skinny. Come to think of it, my pants don't go past my thighs! DON'T say "lose weight" or ask me "why am I TRYING to get fat" Just WHAT am I supposed to do! HELP!