This time of the year is bad for me as well. I just read an article that says that vitimin D is essential for keeping your immune system under control and people with UC and Chrons are deficient in Vitimin D. I am adding that supplement into my daily mix of pills to see if that helps. It makes sense, winter months, no sunlight, indoors all the time. If you are interested I think I read it on the CCFA.org website.
Worth a try.