hello sally and welcome to HCM,
Excessive production of saliva is caused due to less clearence of saliva and is called as sialorrhea.
I read your history , you seem to be physically fit though i would suggest you to approach a physician and the evaluation of few things i will mention which may be the cause of Hypersalivation
and these are ;
Gastroesophageal reflux disease
which is charecterized by almost tasteless saliva in the mouth.
Check for exessive intake of starch.
that is inflammed oral mucosa
toxins like mercury , copper , arsenic may cause hypersalivaion.
neurological disorders is also a cause.
HYpersalivation can be treated by treating the underlying cause so please get it self evluated and discuss the symptoms with your physician.
AS a medication to control saliva ;
(Elavil) 10 mg. three times a day or 10-25 mg. at bedtime can be used but only under medical supervision.
i hope this helps,