Those symptoms are ones I experience in my worse flares (plus urgency).
Sounds like you didn't take the prednisone long enough to help. For example, any time I take, starting at 30 for two weeks or so, it will take about two months to be completely tapered off.
The short course you describe is what they give you for poison ivy or something like that!
49 year old female attorney, diagnosed UC/pancolitis 1985, no surgery but much suffering.
Asacol/5ASA 6x400 mg maintenance for 20+ years; use prednisone & Rowasa for flares.
August 2008 sought care of naturopathic doctor. Food sensitivity test showed gluten, other intolerances; started diet without gluten, soy, dairy, tomato etc. Replete probiotic first, then Forte pills.
Achieved remission for the first time in many, many years!? Seemed so, but colonoscopy Oct. 6 proved not so, heavy inflammation in ascending colon & will be using Rowasa again. But I AM better.