What Causes Severe Cough When Diagnosed With COPD?

Hi. My husband is 58 years old. He has been a heavy smoker for many years. He has a nasty cough and coughs up a lot of mucus. His finger nails are bluish. He was always thin but not has a larger belly. He drinks at least 8 beers every night. He has blood in his fecal matter. He has difficulty walking farther than 10 feet. He gets out of breath when he eats. bathes, or gets dressed. He has been diagnosed with copd. I am trying to find things to help him feel better, but at this point don t know what to do.