Nancy, why do you think you might have lupus? You've likely already found these sites, but in case not:
WrongDiagnosis.com and emedicine article on lupus. I did some reading about lupus after I had a positive ANA test a few years back, but apparently that test has a lot of false positives. Plus the symptoms were not a good fit - recurring rash, yes, but not on face or scalp, gastrointestinal issues, but no pain (well, they were a pain, but not the way that counts), etc.

There are so many closely related autoimmune diseases, all having the same general symptoms - it's enough to drive you nuts! I saw in some of your previous posts that you've had gene-testing done. Expensive, but you may be right that it's the only way to get a definitive diagnosis.