i got the same thing when i was kayaking in Plecencia a few years ago. beautiful place but man it took a toll. from all the beta i got from docotor friends, good old Pepto Bismol is some kind of magic. There's something in Pepto that they don't even know why it works but it does. but be warned it'll turn your tongue and turds black but eventually they'll get solid again. good luck...
"I would drag my balls across broken glass just to hear her fart into a walkie talkie" -Jay Drury