Sjogren's Syndrome Support Group
Sjogren's syndrome is an autoimmune disorder in which immune cells attack and destroy the exocrine glands that produce tears and saliva. It also associated with rheumatic disorders such as rheumatoid arthritis, and it is rheumatoid factor positive in 90 percent of cases.
The bottom line is that even if they do confirm Sjogren's, treatment is still symptom management and usually some sort of disease modifier. If the doctor is unwilling or unable to do that, you need to find someone else.
Good luck!