Suggest Remedy For Diarrhea Post Treatment For COPD

Hi my name is Anup. My father age is 65 year and combating COPD since 2005. But few days ago we found better treatment under Dr. Raja Dhar (Pulmonary specialist) but after releasing from hospital my father get again admission on seriuos breathing trouble issue. Then he get treatment 2 to 5 days and get cure according from breathing trouble issu but at the same time time he faced gastro problem. Doctor analyzed the case and told not to worry they did all oncology test. We get discharge from hospital but till my fathers leg and hand are soiling and three to four time stool and breathing trouble occur during stool. please advice thank you.