My symtoms are stomach pain, nausea, dizzyness, sweating, my urine was a dark yellow/ brown color. It came on gradually, the main episode lasted about 3 to 4 hrs and lingered for 24 hrs. Any food would cause major abdominal pain and discomfort, feeling like i needed to vomit. . This has happened 4 times in 3 yrs and when I went to a doctor they could find nothing wrong with me.