Imodium is my medication of choice also for traveling, etc. But - we are all so different that some take 1/2 (as I do) and others 2 or three to "work". I do have to take mine 2 hours before leaving the house, etc. I have not tried anything else. Sorry I can't be of much help. I do not have diarrhea anymore either (I believe mostly due to Align) but Imodium slows down my system and works for temporary trips, etc.
Good luck! Oh, and Xanax for anxiety - I know I need to stay calm or it gets worse!
ElaineNY