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Nexium is usually given for gastritis
due to high acidity. But if there is jaundice
and gas formation it is more probably due to gall bladder
problem like gall stone or even cholecystitis
. You need to avoid eating fatty, fried, junk food at all costs as this will make it worse. Also stay away from spicy food. Eat yoghurt, fresh fruits and green leafy vegetables, protein rich diet like cereals, pulses, chicken, lean meat. Drink plenty of water. Get assessed for Liver function and Gall bladder problem by your Doctor and also rule out Hepatitis
which can also cause similar symptoms. Avoid eating outside food. Follow up with your Doctor and get appropriate management according to the cause.