I've noticed that not getting enough sleep really affects me too. It's probably not the Prozac--keep up with it!
Taking the immodium sounds like a good idea if you go again. I had an attack the other day (most likely caused by eating too much bread or this new food I tried)--my first D attack in about a month! I took one Immodium, which turned out to be enough. I also noticed it was really mild, not much discomfort after the initial cramps, which I thought must be because I'm following the IBS diet. I did feel pretty down after the attack, but got some wonderful support from the people on this board. I'm back to "Breaking the Cycle" for a couple of days.
Good news: I made it through work yesterday without anxiety or another D attack or even worrying about it! WOWZA!