It will probably take more than two weeks, give it time. The three times I've gone off prednisone, the moon face was one of that last things to go - sorry. That can take months. Probably some of the weight gain was water weight which may come off within the next month or two. One time I noticed there were about
four or five days that I was peeing nonstop and I think that was my body getting rid of that excess fluid. Hang in there and it will come off eventually. Sounds like you are on the right track.
Diagnosed with UC in Feb. 2005
Colazal (9 a day)
2nd Remicade infusion