My guess is that it's your PCP (primary care physician) that you've been seeing. While they can do primary screening, they are not really capable or suitable to diagnose or treat Lupus. You need to see a rheumatologist - the Dr who specializes in Lupus and other autoimmune disorders. They are the ones to diagnose and provide systemic treatment.
To finding a Lupus knowledgeable Dr - I suggest checking with the Lupus Org at www.lupus.org
to find your local chapter of the organization. Then check in with the local chapter to see which local Drs are active on the advisory board -- these are generally the Drs most interested in and most experienced with Lupus in your area.
Lupus presents in many different ways with many different symptoms. We are not Drs here, and can only guess - I would trust my Dr's guess and go ahead with finding the right Dr asap.
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2000DIAGNOSING LUPUS & HW's LUPUS 101
"Life is far too important to be taken seriously." - Oscar Wilde