What Causes Intestinal Cramps Followed By Diarrhea After Taking Busiprone?

since i started to rake Buspirone 5mg twicw a day I have had i9ntestinal cramps,which after twob days became a conatant need to go to the toilet.At times a small bowel movement and then enormous diarrhea.It has been this way for over a week.Immodium has not stopped it.Previously i was on Visteril and reacted in a SIMILAR WAY,BUT ENORMOUS bowel movement while asleep,filling my bed eventhough I wore these protective paper-like undies.I cannot comprehend how much intestines can hold.This feels very much the same.Embarressed,EDI.HELP PLEASE.