Down syndrome adult 23 years old After a period of 2-3 months, he gets cough in chest and nausea and vomiting simultaneously WBC goes up till 15000 he is not aggressive borderline down syndrome no hole in the heart we are not able to get what causes chest infection and stomach problem at the same time Dr. saying reflux induced pneumonia barium showed reflux endoscopy was normal chest ct scan showed mild hiatus hernia he follows a moderate diet still, the same thing happened now still test showed blood in the stool he gets nausea these days suddenly can anyone help to diagnose the root cause so we can go for treatment?