There's not much you can do to make it end faster (it's a virus that will pass on its own), but make sure to take in enough fluids and electrolytes (Gatorade is not necessarily the best, because of all the crap in it). Broth is good, especially if you make your own using lots of veggies, onions, garlic, then blend and strain.
Also, try the BRAT diet: Bananas (make sure they're ripe), Rice, Apple Sauce and Toast. It's bland, and easier to handle.
I had a nasty gastrointestinal virus ('stomach flu'--which is not a 'flu'at all) a couple of years ago (as did MANY people around here) and I remember at one point, I didn't think I'd be able to keep food in from either end! I was thrilled when I could finally add some saltines (which I usually don't eat) to my broth!
Sleep as much as you want and you can, and let your body take care of healing.