The doctor said I had severe asthma,and that my lung function was at a third of what it should be. I am on oxygen at night,at 2and half liters. I have copd,which he said was chronic brohchitis,and asthma. I am on combivent 4 puffs, 4 times a day,and now he put me on advair, one puff, twice a day. What can I expect long term,life expectancy? I do not smoke,and am 47 years old, can't believe that I have this. Tell me things I can do to improve my lung function.,or is it hopeless?