Morning TA66
I am sorry to hear of the difficulties you are having. I have ended up with dry mouth recently for various reasons, yet to be looked into. Have had dry eyes for quite a while and use thealoz duo drops (Boots or Amazon) as recommended by my optician, I no longer wake up with my eyelids glued together! I use Xylimelts from Amazon (or Growing Smiles by Google, not ordered yet, but a lot cheaper) for the dry mouth. Hope these may help whilst you get this sorted out.
Best wishes