Has any doc ever told you not to take Imodium? If they haven't then I would take it for preventative measures. I do it anytime I have something where I cannot afford to spend time in the bathroom. It works great! Along with preventing the D, I think it also settles your mind knowing you took something for the D, which in turn settles your GI tract. I love it and NEVER leave home without it.
Good luck with your classes!!!