Absolutely, you can have it with negative blood work. Actually, about 40% of people with Sjogren's are sero-negative.

You need to see a rheumatologist for a diagnosis of Sjogren's...or even your PCP or eye doctor. Have they done a schirmer's test for tear production?

There are MANY causes of dry mouth and eyes, (usually medication related), but with the joint pain also, it sounds like Sjogren's is a good possibility.

I have negative blood work, but my lip biopsy for Sjogren's was very positive...as was my schirmer's test.

And it is very common to have SFN as a result of Sjogren's...as it can attack the ganglia as well as small fibers.