Peptic ulcer disease causes upper left quadrant
pain that usually begins 2 hours
after a meal. It gets better with over the counter antacids.
Stomach flu can cause indigestion and abdominal discomfort. Viral gastroenteritis can lead to nausea, abdominal pain and diarrhea. The exact location of pain and other details will help in determining the accurate cause .Take light meals. Avoid spicy fried foods. If the symptoms are severe consult a gastroenterologist.
Best of luck and regards!