Ray,
I don't know much about mouth sores, but I am very familiar with the mucositis. There is nothing that you can do about it except wait...in time it goes away. One of my docs ordered me a Yankauer suction machine that works like the suction device at your dentist. I kept it by my easy chair by day and at bedside at night. Anytime I left the house I carried a plastic bag with a box of tissue in it. The mucous often caused me to wake up at night..I would switch on the machine,use it, turn it off and go back to sleep.
Now, 5 months or so after radiation treatment ended, I am returning the machine. I can make it through a whole night with maybe one or two tissues.
Unfortunately about the time that the mucous subsides, the dry mouth becomes a problem and that wakes you up at night! But as you might have read here there are strategies for dealing with that problem too.
One step at a time...keep up the good attitude.

Danny G.