Drink lots and lots of fluids, but clear fluids. Like water, apple juice, etc. You just have to fight through it, let your system clean itself up. That's what its doing. As much as its not...erm....clean for you
Why "besides immodium"? That stuff works!
I was on a ski trip that me and another guy got sick. I had the worst case of the squirts in the history of mankind. Immodium AD shut it down cold. And the other guy's as well. Make sure you follow the directions to take a larger first dose, then as needed.
Good luck and wash your hands!