Could be the Prednisone i am on the down scale with it taking 25mg every OTHER day when i was on 60mg per day a few months ago. I notice on my days "off" i am terribly weak but the dr said that the Prednisone has that effect.. Today as a matter of fact i can barely lift my fingers to type on the keyboard but i have to go to work for 12 hours so i said screw it and took 30mg of Prednisone just to get me through the day..