There are lots of things that can cause excessive salvation. I had a problem with it and other symptoms that added up to a diagnosis of Parkinson's. I also have excessive saliva when my nutcracker esophagus flares up and food won't go through my esophagus to my stomach. Food and liquids back up and I sometimes drool. NE is when your esophagus has the correct motions to move food down but the pressure is too high. Esophageal spasm is when the movement is uncoordinated but the pressure is very high.

In any case I would also talk to your general md. GI's think about digestive stuff. Go's look at the whole picture.

Just my opinion