Oh how can I forget. I was very sick at the time -- huge infection from an peri-rectal abscess and fistula, which was made very much worse by unncessary incisions by a bad doctor (but that is another story). When I got in with good doctors, they quickly ordered a colonoscopy and SBFT. So there I was really ill, colonoscopy on Wednesday and the SBFT on Friday. A week to remember!!! I was weak going in and soooooo weak afterward!
But the SBFT itself wasn't bad at all. I drank 2-3 shakes, and they didn't taste nearly as bad as the colonoscopy prep. I held my breath while I chugged it, and continued to swallow for a few seconds afterwards, so it wasn't bad at all. I sat in a waiting room with an attached bathroom, and the x-ray room was very close by. They did the x-rays every 10 - 15 minutes. Things moved fast -- not much in there after the colonoscopy 2 days before!! What I do remember is feeling "toxic" for 2 days afterward. Not horrible or painful, but just like I had a medium flu. I agree that drinking a lot is the answer. The faster you can get the barium out of your system the better!! My suggestion is to really reduce your food intake several days beforehand so you don't have much in your intestines.
Let us know how it goes!