Entocort is also a steroid, and I think steroids can make you angry. My husband calls it roid rage. He takes prednisone, and he's aggressive, short tempered, and just on edge. I think your anger can definitely be a side effect of the entocort.
When my hubby was on really high doses of pred, he found meditation helpful to try to center himself, and not let the roid rage rule. He would meditate 1/2 hour in the morning and 1/2 hour in the evening, and try to find some peace inside. It was not perfect though. The only way to get rid of the roid rage is to taper off the steroids. Until then, perhaps some breathing exercises, or some meditation can help you center yourself a little more.
Husband with Crohn's
Diagnosed March 2003 Ulcerative Proctitis
Diagnosed March 2008 Crohn's & C-diff, hospitalized 45 days
Canasa, Lialda, Remicade, VSL#3, Florastor
In Remission since June 2008
Stopped vancomycin for c-diff Jan 1 2009
C-diff free, and in crohn's remission, knock on wood