Rocket,
The test is called a CT Enterography and the beverage you drank is called volumen, which is a barium sulfate suspension. I am surprised they did the CT Enterography as opposed to the MRI Enterography which I think may be a better diagnostic tool. I had both done. You drink volumen in timed intervals with both procedures and both procedures take over 2 hours (MRI is longer and takes closer to 3 hours). The only difference in the procedures is that the MRI Enterography is a bit noisier and with the MRI they inject you with glucophen in order to slow the bowels down. Glucophen causes nausea and vomiting in 50% of injectees, but I happened to be in the 50% that tolerated it, as I did not vomit in the basin they gave me nor did I feel nauseous. Although the contrast burned terribly when they injected it.
You may want to ask your Doctor whether the camera endoscopy may be a viable diagnostic test based on your situation. I am told it's better than the CT and has become safer.
BTW I found the volumen tolerable if you drink it rapidly and do not savor the taste. It's not exactly something I would order at my local pub, but as a 41 year IBD veteran I have tasted more vile substances, including liquid potassium which is really gross.
Good luck.