I think this must be common with Lupus. I have the same problem sometimes, especially if I am flaring. I don't know if it has so much to do with being weaned off of Prednisone, I think that it is more likely due to the Lupus flaring. Have you told your doctor about this problem?
Lupus for many years. Like most of my life. Sjogrens that started at 35 and Scoliosis, Spinal Stenosis, Degenerative Disc Disease, Osteo-Arthritis of the spine, Ankylosing Spondilitis, Periferal Neuropathy, mild CP and now just recently diagnosed with PA. I had a disc replaced in December of 2007.
Plaquenil, Sulindac, Imuran, Celiac diet, Tramadol and B12 shot once a month.