I Suffer From Over-active Salivary Gland Which Are Especially Troublesome

I suffer from over-active salivary gland which are especially troublesome in the evening and at night. In the morning my pillow cases are soaking and unpleasant. This condition embarrasses me and causes drooling etc when talking to friends. I have cerebral vascular disease. What can I do to alleviate this condition? I am 78 years old.