Hello,I had gone through your query and understand your embarrassing situation.
Brief answer: Yes ,frequent diarrhea is one of the signs of stomach flu or
gastroenteritis.
Detailed answer: Diarrhea is a food and waterborne disease.You may have frequent diarrhea due to food habit.Since you have had surgery for gall stone (?
Cholecystectomy),you may have problem with fatty food.
Abdominal pain during diarrhea is not uncommon due to increased intestinal motility.
Is your stool mixed with blood and or mucous?Do you have fever? If the answers are NO,then you need not to worry for now.If yes ,you need to contact with your physician as this condition requires prescribed medicine.
On the other hand, during you diarrhea continue drinking ORS( oral rehydration solution) after each
loose motion.Stay conscious for any signs of
dehydration like irritability,sunken eyes,thirst,skin pinch etc.
Hope that you will be okay with the ORS intake only with patience.
If you have additional questions, please do not hesitate in writing to us. I will be happy to answer your queries.
Wishing you good health.