Warren,
The phlegm was quite a problem for me. MDACC prescribed a Yankauer suction machine...sort of like you use at the dentist's and it really helped me. I kept it by my easy chair during the day and by the bedside at night. When I went out I had to carry a box of tissue.
The good news is that this too will pass. Once the phlegm stopped waking me up, however, the dry mouth replaced it and that woke me up!

Take care,
Danny G.