Sinus Drip and Dry Mouth

I have a leaking in my sinuses which leaks down the back of my throat. My saliva is very thick, which leaves my mouth dry all day everyday. I drink a sufficient amount of water daily to combat this, however its been to no avail.
My breath stinks all day. Constant brushing does nothing to help.
Please Advise.
Thank You.
I would advise a consultation with an ENT specialist. You could have a sinus infection and or silent acid reflux.
Hope this clears things up.
Scott D. Gold MD