I once got Diarrhea when I was at a friends house. I didn't wanna tell his parents that I had it, so I held it in for the time I was staying there (Week and a half). I could barely even stand most of the time I was there as well. After that time passed, I went home, took some pepto, and then took the mightiest stuff of my life.
That stuff was so mighty, steam came out of my toilet as it was happening (I kid you not)
Lesson here: when you have Diarrhea, get some pepto ASAP!