I have been suffering from chronic persistent dry nose with irritation/itching from 1 year. Actually I was working with certain unknown bacteria or virus in a lab without mask. I felt uncomfortable with suffocation. From that time I developed this disorder. No sneezing or stuffiness is bothering me except this irritation/itching/dryness in nose. Steam vapour, saline nasal spray did not work much longer. I don't have dry eyes or dry mouth. Can it be a symptom of Sjogren's Syndrome or some other immune disorder? What is the test for Sjogren's Syndrome? I have no nasal obstruction as confirmed by endoscopy. What are the tests I should do or what are the medicines I should take to cure this?