food poisoning

So last night I ate my left over Olive Garden that has been in the fridge since saturday. I at it and at 4:00am this morning my stomache and my back hurt so bad. It was a feeling like my insides were cramping up and I couldn't fall back asleep. Once my alarm went off I woke up and it all goes down hill from there. Now I'm at school because I have to be here and if I wasn't I would fail my project and get a 0. I feel like crap and every two seconds I'm going to the bathroom. Its horrible I wish I could go home!!!