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The chest pain
is probably due to high acidity. She needs to eat bland, soft, food at every 2 hourly intervals in small amounts. Let her lie down for sleep only 2 hours after food, till then she can lie on an incline of 45 degrees. Avoid drinking too much water. Let her take in sips. Give bananas to replenish the lost nutrients in vomiting
. Continue Pantoprazole
. If she is having loose stools and/or fever her gastroenteritis
needs to be treated with proper antibiotics. Kindly get her treated accordingly.