I know exactly where you're coming from. My emet flared up this year
during the last three months of my senior year, and boy was that fun
struggling to stay at school the whole day.
It helped me to keep myself well fed, which meant snacking during the
day eventhough I wasn't really supposed to. I liked to bring along dry
nuts like almonds or pecans, and granola bars worked pretty well for me
too. Not the kind with chocolate, but one of the healthier brands. I
was worried about gaining weight since I was eating more often but I
didn't.
Good luck to you in class. Let us know how it goes.