A group of us ate. I was the only person to get sick. I was also the only person to eat a Chicken Sandwich, I was the only person who ordered something with Mayo. About an hour after eating I felt sick, I threw up the partially digested sandwich. This was 5pm. I went to sleep and woke up around midnight. It was absolute warfare out of both ends for the next 12 hours. Diarrhea, Vomiting, at the same time. Complete with painful chills and a headache. I was also very dehydrated, my mouth felt like a desert but whatever water I drank came right back up. The worst symptoms lasted 12 hours, after that I was able to keep some water down, eat some applesauce and take some aspirin. I then laid down and slept for 14 or so hours. We are now 36 hours from the point of ingestion, I still feel very nauseous, like the vomiting or diarrhea could return at any second. I am also still very tired.