<human>: Not today, but for some reason it just came to mind. I had been having some stomach problems and unexplained abdominal pain, so my doctor asked me to have an upper GI scan to see if that would reveal any cause. I had to drink two Big Gulp-sized cups of barium before the test, which was a horror in and of itself because a) it tastes like shit, and b) I had not eaten much of anything for days beforehand because I was feeling so bad and had no appetite at all. 

After the test was done I was told to drink some water and have a meal before going to bed, and then I was simply sent home. Considering my stomach had shriveled up from non-use and the last thing I consumed seemed on par with what I imagine the mixture of horse glue and jizz tastes like, I really had no desire to eat or drink anything. I went home and went to bed. 

Fast forward to that night, I am having crazy stomach cramps and feel like I have to poop so bad but nothing will come out. I think my insides are going to explode. It turns out the technicians at the center where I had the test done were not adamant enough in telling me the need to drink A LOT of water following the test. They did not tell me what would happen if I did otherwise. What did happen is that the barium cemented itself inside my colon. I ended up having to actually pull golf ball sized... well, balls... of chalky white concrete out of my ass for about half an hour.

Give me the gist of the text in a nutshell
<bot>: I didn't drink water after taking barium for an x-ray and it plugged up my colon forcing me to excavate.