Hello welcome to the health care magic You can have viral gastroenteritis like infection But if improvement not seen than stool routine micro examination, occult blood test and CBC should be done... If needed antibiotic course or anthelmetic drug given as per report Avoid excess spicy foods Avoid stress, smoking, excess tea etc like irritants Yogurt included in diet Maintain hydration with lots of water ORS also should be taken Take probiotic tablet for five days Fatty cyst is not related to gastroenteritis.. It is different issue Take care Hope this will help you