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.
Good luck.
If extra-fiber (miralax, etc) makes you LESS constipated then don't worry about what I just said.
get lots of exercise like WALKING in addition to drinking water - AND keep a little FOOTSTOOL in the bathroom. Putting your feet up on a stepstool puts you in more of a squatting position which is how most people in the world defecate. IT REALLY HELPS!!!
Good luck - if none of that works, ask your doc for a RX.