Can you split your prednisone into two doses and see if that helps?
When my son was on prednisone, everyday shortly after dinner he would get these intense pains in his abdomen that didn't really feel like UC crampy pain and we gave him GasX strips and they helped quite a bit.
Definitely talk to your doctor. He should be able to help you.
Hope you feel better very quickly!!!
Mom of Son 17 UC dx 07/02, Sulfasalazine 6g, Azasan 75mg, Cortafoam (when flaring), folic acid, L. Reuteri, Culturelle, Zyrtec, Iron, Vit/Min
Daughter 10 UC dx 08/07 Colazal 750mg x 3, 6MP 12.5mg, Iron, Vit/Min., Culturelle