Nausea, heartburn, indigestion, upset stomach, diarrhea!
But seriously, once I hit high school missing class was really no longer an option. Now that I'm in my major's classes for college missing a day can easily set me back a week. The best thing you can do is email your teachers and ask them for some help. Many previous teachers I've had will go out of their way to help a sick student so long as you ask, are nice about it, and have a doctor's note
