hi Dr. Dorian, my issue is, my dad was diagnosed with advanced colon cancer. as we speak now, his appetite is very low, drinks just sips of water, n of late like 3days back, he vomits.at night once n in the morning once. the vomit is green like....stinky....mucus like. if he doesn t eat much where does this come from? n he has only one kidney which doesn t function so well as per the doctors, n there is a tumour growing near it. he is currently taking morphine, has constipation problem.... dr. plz advise...