I know how unbearable it could get with running of the stomach especially if it's the type that make you visit the toilet every minute. You are not alone, I have been there myself quite number of times. And anytime I am experiencing purging, it used to be very severe that sometimes I will have to cancel going to work that day, so that I won't go and be frequenting the toilet in the presence of my colleagues.
The drugs I usually make use of are Flaggin and Tetracyclin. All you need to do is to buy them from near by chemist, which sell them at cheap prizes. Just follow the physician prescription in taking them. Trust me, they are really efficacious in treating either diarrhea or purging stomach.
Another thing you can always use to prevent purging from happening is by eating bitter kola anytime you sense it's about to happen. This bitter kola will solidify your stool so that it doesn't get to the point of turning into purging.