I had my gall bladder removed a year ago this month (happy birthday to me!) I always had trouble with a "touchy tummy" before my chole... My mom was the same way, anytime we ate anything fatty or "heavy," we'd be fighting over who'd get to be in the bathroom first... :uhoh21:
After surgery, this was even worse! No fried foods, no fatty foods, (yeah, like I needed THAT stuff), no cole slaw, nothing that would go right through me... First they even had me do a course of Flagyl, thinking that might "fix me" (nope)... Aside from putting me through all those fun tests you mentioned (which I REALLY didn't want) there wasn't much else to do, so I went out on my own to find my own cure, forget all those tests...blech
I've eventually found lots of fiber, no fried foods, and keep imodium in my pocket seems to work for me.
The one nightmare food, and of COURSE the one I'm always craving, is eggrolls! Don't let me near them, or you won't see me for the rest of my shift..hehe