From the middle of my Freshmen year of high school to almost the end of my Senior year of high school I was corn free (along with gluten free--have been since I was 2 yrs old), corn is MUCH harder to cut out than gluten, but it can be done. I would suggest doing the corn and gluten free thing for a while, then slowly start trying small amounts of corn (for me it was non-processed corn on the cob that I had for a while before being able to eat any sort of processed corn products). The big problem with corn is HFCS (high fructose corn syrup) and other corn syrups that are in most processed foods. I would suggest doing meats, veggies, rice, potatoes, beans, fruits etc. for the time being, it's going to be a lot of cooking but it'll give your intestines time to heal before you start introducing more of the processed foods that could be causing you problems.
Good Luck!