I just had the stomach flu and it was the sickest that I've been in years. First few hours were all puking and that was followed for the next few hours by constant diarrhea. Following that, I had the worst body aches, fever, cold chills, etc. while still having a bit of diarrhea. It was so bad that I couldn't sleep or even concentrate to watch TV. Over those two days, I ate two pieces of toast and a banana. The third day I started to get better, but my stomach could barely handle anything still.
That's the type of sickness that's been going around here. They even closed a school all week since 20% of the students/staff were out sick on Monday. More were getting sick at school that day too, so they said fuck this!