Hi, Biliary sludge can cause mild to severe complications like nausea,vomiting, abdominal pain or biliary colic,cholecystitis pancreatitis etc. Watery diarrhea are not directly related to this sludge but it might have shown some other complication so,immediately contact your surgeon. You might have irritable bowel syndrome or acute gastroenteritis or duodenitis etc. You must undergo routine blood,urine and stool examination,liver function tests with x-ray abdomen or ultrasound of abdomen. You will have to take antibiotics ( quinolones with antiprotozoals) with antispasmodic and antacids with other symptomatic treatment. You must consult your operating surgeon for further advise urgently. Thanks.