Take a soft diet like milk, curd, rice, daliya, fruits etc for the next 2-3 days. I would recommend Bananas in all patients with gastroenteritis. Take plenty of fluids orally.
If your diarrhoea has resolved, then just add an antacid to the regimen ( like Pantocid DSR) twice daily for next 3 days.
Health Tips
In case the symptoms persist, do see a doctor nearby to rule out any other cause ( like heart disease )