There's a stomach bug going around. My nephew and husband just got over it.
The most important thing when stuff is passing through your system really fast is to stay hydrated. Drink lots of fluids. Try eating small amounts of "lighter" veggies like cucumber and zucchini. Get some low sodium fat free chicken broth, that will help with hydration and give you a little protein.
If it doesn't clear up in the next 48 hours, you may be having an allergic reaction to something in the packets - but for now just watch it, stay hydrated, and eat whatever packets you can. Most of all, feel better!