Depression can be caused by changes in hormones. Hormones can be affected by Lupus and other AI diseases. It is impossible to determine which came first, that is, we don't know if depression can cause a flare or if depression is part of a flare.
Depression and all your other symptoms, inflamed joints/muscles, rash etc should be treated whether you have a diagnosis or not. If this isn't happening, please consider getting a second opinion from another Rheumotolgoist.
Hope you feel better soon,
Lynnwood, Lupus & Sjogren's ModeratorDIAGNOSING-LUPUS & LUPUS-RESOURCES
"Life is far too important to be taken seriously" - Oscar Wilde