A Friend of mine got it once, and one of the guys wife, told him to drink a glass of black berry brandy. I love Black Berry Brandy. You can watch the fumes, move around the glass, and up the sides. Anyway, he took it, and felt great the next day, but was still cautious about farting.
But it would be better to go to a doctor, and be sure of what you have. There are all kinds of little nasty's living in untreated, or boiled water. Amoebas, protozoa's etc. All can cause similar symtoms, but some are a lot more serious, than others, and can cause damage to organs. So it might be better to get checked out as to what it is exactly that you have. Try the Brandy, but still go get checked out. After, you have straightened out from the Brandy.
Wayne