An upper GI series? A Fluoroscopy? Had to drink a lot of Barium and whatnot while they did X-rays? I had that done on the 16th. Because the Barium is so thick it can cause constipation so they recommend you drink a lot of liquid that day and for a few after. I don't think it's anything to be concerned about as it is a common after-procedure-effect. If it doesn't clear up though or gets worse, it wouldn't hurt to call and ask a Dr.