Hi welcome to HCM... You are having diverticulitis condition.... For that usually we are giving laxative like ispaghula husk in milk... But you are having diarrhea since 12 days so needs to see doctor .. If dehydration more you can be admitted in hospital and given transfusion of normal saline ... You might given cefuroxime and metronidazole like combination drug to cover aerobic and anaerobic organism.... If needed and no sign of infection than antidiarrheal medication given... Meanwhile Maintain hydration with more water.... Avoid excess spicy foods and non veg foods .... Take care Advise : consult gastroenterologist ...