Are you taking steroids for the lupus? If so, that could be the culprit.

Just taking a wild stab here... I've heard many lupies say that their treatment drugs cause weight gain.

I have hasimotos & fibromyalgia as well. They believe I lupus but that it has not fully formed yet so still undiagnosed. I know with my hashimotos my weight was constantly fluctuating. The thyroid gland is kind of the bodies control center regulating everything from ovaries to brain chemicals. I also had swelling and small nodules in the gland and was oh so thrilled to have it removed. I had to finally see an endocrinologist to resolve the issue. After many years of battle I finally realized that the at large medical community is not equipped to handle extensive (hasimotos) diagnoses/following of the thyroid gland, it is definitely a speciality. Fibromyalgia's main symptom is fatigue. What meds are you taking for the fibro, just curious I can't seem to get one that works and with all the vioxx/celebrex scandals.....Ugh

hope you get it resolved quickly!