I am a 50-year-old female.  My blood pressure is low to normal.  I was diagnosed eight years ago with Fibromyalgia.  I currently take 90 mg of Cymbalta every day.  Three or four times a week I take 2-3 mg of Tylenol (although it doesn't help much).  I recently was told that my kidney function was 51.  My doctor wants to recheck it in three weeks.  I am wondering if the medication I am taking could be the cause of my decreased kidney function or whether I may have Lupus instead of Fibromyalgia.  I would appreciate any insights you can offer.  Thank you.