Chaya - I think I am right in that you also have IBD (either Crohn's or UC?), my Complement levels tend to run higher most of the time, but my Rheumy and GI both believe that it is due to my Crohn's never being in remission.
Labs are very confusing and some of mine tend to overlap with have more than one Auto-Immune disease.
I am happy that your dr. is diagnosing you so that you can get the proper meds balance.
Diagnosed with Lupus - April 2002
Diagnosed with Crohn's Disease - January 2003 (problems since early 1990)
Meds: Flexeril 10mg as needed, Plaquenil 200mg, Probiotics, Multi-vitamin, fish oil, Cal/Mag Supplement
Off Immuran as of April 1st and doing well!!