I have been using some mind body approaches and am convinced of the mind body connection with my UC. Right off the bat, I want to say that one approach will not be right for everyone, anymore than one med will. But no matter the approach, I do think the mind body connection is undeniable, yet western medicine really is lacking in incorporating it.
A good book by Gabor Mate' MD is When the Body Says No- Understanding the Stress-Disease Connection. There is a chapter in which he talks specifically about IBD, stress, etc. and the placebo effect, which in some studies have shown a 55% response to placebos!
I'm currently working with someone who uses Somatic Experiencing that's described by Peter Levine in Waking the Tiger - Healing Trauma. With that, meds, supplements and diet, I'm hopeful for a good life.
I think whatever helps is worth trying, and I'd like to hear how Dr. Weil's hypnosis works for you. If it doesn't, keep looking!