'Food poisioning and balance?

Today is my 3rd day dealing with food poisoning. The main thing I can't get over is the nausea. If I'm sitting down I'm fine but when I stand up or lay down I get this intense nausea. Can anyone give me any tips on getting over this? I've missed 2 days of college so far and I know I have to go today but I just can't stop throwing up whenever I stand up. BTW: From 3 days I only have 3 soda crackers and a lot of ginger ale in my system. I can't even think about food without getting queasy, but could this be the problem?