Sjogren's syndrome can effect the liver. There maybe other diseases too. I know there is an autoimmune hepatitis that is different from hep A, B & C. Your RF factor can get crazy high, but I'm not sure it neccesarily corelates with disease activity. Healthy people can be RF positive too. Also your likelihood to be RF positive tends to increase with age.
I definitely think the rheumatologist is a good place to start.
RA, Fibro, Migraines
Enbrel, methotrexate, lodine, sertraline, relpax, nortriptyline, gabapentin, and vicodin