I will firstly admit to not having read through the other replies, sorry, i just popped on for a quick peek before bed, but i saw this and thought i'd just reply.
I am in the UK and i take at times, an anti depressant called (here in the uk) Citalipram. I know it goes under a different name in Canada as a friend of mine there has taken it. This med is especially for IBSers. You don't have to have depression to be prescribed this as most doctors know of its helpfullness with IBS. I find it calms me and my tummy, helps dramatically with the anxiety, and i am of the state of mind where i hate to leve the house, supermarkets cause me tremendous problems, but with Citalipram i find it takes the edge off and really does help.
Hope this helps you
Indigo