I have extra saliva and a really nasty perfume taste in my mouth. what could be wrong?

See your doctor: These symptoms can only be adequately diagnosed only after a thorough evaluation by your doctor. This may include labs and other satudies. Once all of the information is in, your doctor can let you know what's going on, and what to do to help you.

Diary: Should keep track of when you get this taste and what you are doing at the time when it appears. A diary. Can be many causes and i would consider seeing a doctor and/or a dentist.