Ugh, that sucks. Three Imodium is definitely not enough to stop you up if you're having really bad D. Back when I had D all the time it wasn't unusual for me to take 15 Imodium in one day ... and I'd still have 2-3 BMs.
I guess it probably doesn't matter too much what you're eating since it seems to all go straight through anyway, but when I had really bad D I couldn't handle white rice -- it just went straight through me. I ate fat-free saltines (I couldn't handle regular saltines), white bread (I made it myself so I knew what was in it -- flour, sugar, salt, water, and yeast), and instant mashed potatoes. The mashed potatoes were safe, just dehydrated potatoes with no dairy or anything, and I made them with only salt and hot water. I added a little bit more water than normal so that it was the consistency of pudding, and while it wasn't very interesting to eat, it had the best chance of sticking with me.
I hope the afternoon goes a bit better for you.
-------------------- jen
"It's one of the most serious things that can possibly happen to one in a battle -- to get one's head cut off." -- LC