You might actually need to go back up. When on 4.5mg. I did not want to because of eye pressure and heart condition, however had "to bite the bullet" and went back up to 7.5mg and am feeling much better. At this level I find I can make up an exercise plan and do it. Three days I go to park with Lily, dog, walk as much as I can for the 50 minutes to an hour that I stay there and three days of of walking by myself on paved trail by the river. This morning it was the park. I walked for 28 minutes before sitting down for 2 minutes (this included some additional uphill) after 2 minutes of sitting, walked another 20 minutes. Came home and feeling good. My theory is that seeing the adrenal glands put out about 7.8 mg of cortisol, the 7.5 of prednisone takes most of the burden while the glands get ready to start producing again. I'm hoping I can go down to 4mg in a week and that the adrenals will step up to the plate. 🙂