A variety of diseases can cause nausea and vomiting. Examples (this is not a complete list) include gastroenteritis
, food poisoning, acute non-gastrointestial infections (i.e. pneumonia, pyelonephritis), obstruction of the stomach, small bowel or colon, liver or gall bladder disease, pancreatic disease, peptic disease or cancer.
You are experiencing nausea and vomiting associated with meals, flu-like symptoms, and chills.