Well, his labwork came back completely normal. Soooo, I am inclined to think this is really and truly a brain/gut dysfunction resulting in IBS.
He's eating oatmeal this morning, albeit reluctantly. And will get back to work on some late assignments at the top of the hour. Tomorrow we see the therapist and I'll follow up with the GI with an email today and a phone call on Monday (they are not in clinic today). I guess I'll hold off on the hombound instruction forms until next week to see how it goes...