Hey bunny! I also sometimes see chunks in the loo...undigested food, etc. It's ick for sure.
Re: the small bowel series: this was a pretty easy test for me. The CT scan w/ contrast was much worse because the six cups of chalky liquid were much tougher to handle than the simple two or three cups required for the SBS. After you drink the stuff, you go in for x-rays about every 10-15 minutes until the barium reaches your colon. For most people, that should take a couple hours; for some it takes longer, and for me it took about 25 minutes. At the end of the x-ray series the radiologist will come in and do a sort of ultrasound to look at your terminal ileum. Easy as pie!
Good luck and let us know how it goes.