What Causes Vomiting, Diarrhea And Stomach Pain After Eating Chicken Sandwich?

Hello, Two weeks ago I had what I thought was food poisoning. I had ate at a Wendy s and did not eat my entire chicken sandwich because after a few bites I had a bite that tasted like raw chicken. I vomited through out the evening and had bad diarrhea and bad stomach pain, however it only lasted til the next day and then a week later I started feeling sick after I had breakfast. I again vomited once and now I have had diarrhea for a solid week, three days of this week was severe and now its just about once or twice a day and my stomach is very nauseated. Today for lunch I had grilled chicken with a salad and it also had mushrooms and cheese on the chicken. I did not have any diarrhea or nauseasness until after eating lunch. Can you give me any idea as to what would or might be going on? thanks