I can understand , two months ago I tried to taper off prednisone and as soon as I would get below 15 mg I was hit with bowel issues and severe arthitis issues.
I am now taking 2 Caltrate (calcium and Magnesium ) a day for bone denisty, it seem to have help my bowel symptoms somewhat . I began tappering again a week ago and it seem much better, but I am only going down by 2.5 mg/week .
Best of luck