I suggest you see a rheumotologist. They are the Drs who know all the subtle nuances of how Lupus and RA act, and how to read all the tests and evaluate your symptoms. Neither of those illnesses is diagnosed by blood tests alone, your symptoms have a huge effect of determining your diagnosis.
Primary care physicians are not trained in the details of these and other auto-immune disease -- not only are they not great at diagnosing them, but they are NO GOOD at treating them. Seeing the right Dr can make a huge difference in your treatment and how you feel.
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2002DIAGNOSING LUPUS & LUPUS RESOURCES
"Life is far too important to be taken seriously." - Oscar Wilde