I had an ear infection that had me lose my balance completely and start projectile vomiting anything in my stomach, including water. It was probably a good 36 hours before I was admitted to hospital; I was so dehydrated I was put on a drip. It turned out to be shingles, so no wonder the antibiotics didn't work. I can't remember how long I went without eating, maybe 48 hours? I was so ill I didn't care.