are you dehydrated?
highly likely because you probably have a loop if your jpouch was left in place.
get hydrated first
and then start on tiny tiny very frequent "mini meals" on "mini plates" - say just a bite of banana and a half a cracker. or one spoon of peanut butter.
it will get better ally. this loop ileo could really change things positively for you. Try to get your mind around it so your body can try and heal.
Good luck