I'm officially one week out of treatments as well, and having the same issue. Did your dad ever find anything that helped cut the mucus? I can't sleep because it all gathers so quickly. I have to cough it up about every 15 minutes to keep from choking and then throwing up everything I was lucky enough to get in my stomach. I haven't slept in almost two weeks...and I'm just exhausted. But I fill a 10 qt bucket daily with 100s of paper towels trying to get the mucus out. It just keeps coming.