I have on and off problems with saliva over-production too. Most of the time, I'm fine, but there'll be like 1 day out of 30 that I'll suddenly be producing so much saliva that my stomach is swollen and bloated from continuous swallowing, and I have to start spitting in to a cup ever 20 seconds or so. I find that drinking cranberry juice helps because it's a diuretic so it gets rid of the excess water in our bodies.