Gastrointestinal Conditions Listed below are the gastrointestinal conditions that we treat: Gastroesophageal Reflux Disease (GERD)in Nassau County Achalasia in Nassau County Blockages / Scarring of the Intestine in East Hills Diverticulitis in Nassau County Gallbladder Disease in Nassau County Gastroparesis in Nassau County Intestinal / Stomach Bleeding in East Hills Pancreatitis in Nassau County Polyps in Nassau County