Losing weight

So recently I was put back on a high dose of prednisone for an autoimmune disease I have, I’m down to 9 mgs and honestly, yes I have gained about 15 lbs from cravings. It’s really starting to get me down, especially now that I feel so uncomfortable about my body. I’m trying a lot; drinking at least 6 cups of water a day, exercising- bike rides and walking, eating less, trying to eat healthier. The pounds are just sticking around and I feel horrendous- any help?