The Internet does not work for medical self-diagnosis. It's great for buying skis and seeing pictures of your friends' dogs, but as for finding out why your stomach hurts, it can only cause panic. The symptoms for every illness are the same: fever, headache, chills, bowel irregularity. You just described almost every virus and disease in the world. You could have anything from a case bad of chicken wings to a terminal illness. But since those symptoms are the same, you will always assume the worst and then worry yourself even sicker. Stay away from the Internet sick people.