For your specific concerns about depression & IBD, the Crohn's & Coliitis Foundation of America (www.CCFA.org) has excellent resources on
IBD & emotions:
http://www.ccfa.org/frameviewer/?url=/media/pdf/emotional.pdf&LMI=1.1
IBD & depression:
http://www.ccfa.org/living/depression/?LMI=1.3
Hope