Try to eat something, as hard as it may be. I've just had my wisdom teeth out and I had to force down yogurt so that my stomach was lined with something before I took Vicodin (woo for drugs!). Otherwise the painkillers will just make you feel sicker, or so the doctor person said. It really does help if you eat something. And remember to stay hydrated, you will feel even worse than you do now if you get dehydrated as well.
Feel better!