I just want to add my experience with Sjogren like illness.
A few years ago I was seen at Mayo for nondescript gastrointestinal inflammation. It was a form of autoimmune inflammation. At the same time I developed dryness of mouth and eyes. Little saliva, on and off enlarged salivary glands, red blisters inside lower lip and cheeks. Eventually, my teeth became almost see through due to lack of saliva.
All testing several times was negative for Sjogren’s.
The general opinion was that it was an autoimmune condition.
After treatment with immunosuppressive medication, all gastrointestinal symptoms cleared as well as the dry mouth and eyes.
Actually , now I drool involuntarily at times!