Boxer ulcerative colitis...HELP ME PLEASE! good diets? places to help me...

[babygirl62542]

...out? medicine that works? anything!? My boxer has ulcerative colitis and nothing is helping. we have been battling this for 4 months now. she has been to the vet (numerous vets); she had a colonosocopy and biopsy to be sure of what we are dealing with, and she has been prescribed various meds and nothing is helping. we're running out of options (and money). she has had diarreah for months now and it's gotten worse. she is litterally spilling liquid out of her bum. she has to go out about 7 times daily (twice in the middle of the night) and has lots of accidents in the house (i'm basically losing my mind) it's not a potty training problem, she just can't help it. she litterally explodes when she gets out the door, if she makes it out. she is losing so much weight i don't know what to do. also, we live in an appartment, and our neighbors are probably not too happy with our "lawn ornaments" but it is impossible to pick up after her. i need help, does anyone else have this problem? has anyone delt with this before?
she was eating innova large breed puppy food, then we tried the eukanuba intestinal care diet, and now we're trying nature's recipe easily digestible nutrition puppy. none of them seemed to make a difference. it sounds like a lot of switching, but we gradually swap her food so we don't upset her stomach too much.
oh, and her medicines she's on right now are:
Prednisone, metronidazole, sulfasalazine, and imuran.