So you have dry eyes and dry mouth
only, but no positive test.
For dry eyes, there are numerous causes- many medications, smoking, diabetes, thyroid disorder
, hepatitis C
, any local eye or oral diseases etc.
to make a diagnosis of Sjogren syndrome, one need to have at least 4 out of these 6 parameters--
3.positive Schirmer/Bengal test
5.positive immunological blood test
6.enlarge salivary gland
with decrease salivary flow (tested by a physician)
If you are saying that all the tests are negative and there are only dry eyes and mouth - than it cannot be Sjogren. Please confirm again.