I have sjogrens, along with my lupus and antiphospholipid syndrome. Treatment for sjogrens is mostly symptomatic (eye drops etc) so whether or not you have sjogrens (the blood tests will clinch that as there are antibodies that are used to dx sjogrens) then it makes sense to treat your symptoms.

It sounds like CPAP may well be playing a role in drying you out a lot as well.

best of luck with it all

raglet