Hey Steve,
I had that mucus/drool problem going on after radiation too. It goes away. You're only 5 weeks out. It takes a few months actually. I remember putting tissue under my cheek. Eventually it does stop.
Speech-wise it was really tough for a few months too. I ended up having surgery and having 3/4 of my tongue removed, and I am still more understandable now then I was a month after radiation. It'll get better for sure - it seems an enternity while it's happening but ya just have to wait it out.