I used to have it on misprescribed antipsychotics but I suppose you didn't recently get antyhing new in that field?
Any infections in your mouth? Sore throat?
Wikipedia says, hypersalivation can be caused by huge variety of very different conditions, including anxiety and any problems with swallowing.
_________________
Let's not confuse being normal with being mentally healthy.
<not moderating PPR stuff concerning East Europe>