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You could get your stool tested for occult bleeding, parasites as well. Get your liver
function tests to rule out gall stones
. Also get your haemoglobin
and blood counts checked. After the colonoscopy
it would be safe to rule out some diseases and be in a better position to make the probable diagnosis. Keep away from wheat, oats, rye, barley, milk and milk products, spicy food, oily food. Eta plenty of fresh fruits and green leafy vegetables. Drink plenty of water.