Wendy!
Hugs to you for what you are going through. I have never had arthritis in my back, but have recently pulled a muscle there. I can't imagine how difficult it would be to have this pain all the time as you do! i do know that taking the weight off is the surest path to relief. I have been told (with knees) that even replacement will not be totally sucessful unless weight is shed first.
I do take glucosomine. I have been told that it is only effctive though in a glucosomine - chondroiton combination. I am not sure if this is true, but that is how i have always taken it. it does help but takes about 3 weeks to notice any effect. It must be taken on a regular basis to help.
Best wishes to you for relief!