How to run with foot pain?

so i havent run in like forever. and i've been trying for the past few days, and i just can't do it, when i run, it's like my feet don't work. They just stay flat and i trip and stuff. i kinda just wobble, and i cant run fast or long at all! its like i just run on my heels or something. and i have to run a mile in like 2 weeks, and i dont know what to do! i can hardly run, and i'ce been a great runner before, but it seems like since i took a break, i just cant anymore. and i dont know what im going to do, this has never happened before. i dont get why it is now. am i to lazy, i dont think i am. but we were practice running in gym, and i tripped! i dont know if it was my feet, i dont think it was just me, cause normally im a good runner! if anybody has any advice of how to stop this strange foot thing (its with both feet) i would luv it, even when i practice running it doesnt seem to help. So pls help me! i want to get a good time on the mile, and be able to run again! its so annoying. pls help me! i really need it.