I have ulcerative colitis also. Found out through trial and error that rice is my trigger -avoid that and eat activated yogurt and suchlike regular and no real problems.
Have you tried eating a couples oz.(about a tablespoon size) of fresh aloe flesh before going to bed( or on an empty stomach)?
That's been an amazing cure for me and several people I know.
Ironically, the ones who poo poo it or say it doesn't work are the one's who haven't tried it.
The German people have a word for that, but I don't know how to spell it.