Hello, I felt that I should write to you, as I had been suffering from horrible pain in my joints that had been worse at night.  I too had "normal"  blood work for over 2 years...until a friend of mine, with lupus, told me to ask for an ANA blood screen-which I did and it came back positive.  I was diagnosed with SLE.  My advice is, "If you are not feeling well-be persistent, do your research and insist that more testing be done."  Quite frequently I felt put down by doctors, who kept insisting that I should exercise more and get some counseling.  You are in charge of your own health, so make sure to take care of it.  What struck me the most was you said you felt 100 years old, I totally felt that way as well!!Good luck, and I hope you feel better soon!