You might want want to check to see if your husband has "thrush". My mom got it while on radiation theropy. It was real bad. She said it felt like razors in her mouth. She was also very dry in the mouth as well. She coughed and was totally miserable until she was put on medication for it. A nebulizer treamtent also helps. He will cough a lot more after and produce a lot of phlem, but that is what you want.
Scandishakes are like ensure but much better. They have 600 caloires per serving, and 45 grams of fat. It is great becasue it helps keep the weight on so much better than the "ensures" and the like. Scandishakes can only be ordered by phone or email. Got them info. on them from one of the nutrtiionist at the radiology place. You could "google" them too as well. i do not have the info.
For a while, it would take my mother all most 3 hours to drink 4 ounces of the shake, and 4 ounces of gatorade. (another product highly reccomended). Good luck and hang in there.