It was a blockage -- they gave him fluids and a catheter and then let him on his own this morning to see if he would be okay...but he blocked up again. So now they are doing the same thing and keeping him another night.
It's better than I thought as far as funds go, though -- because while it is going to be expensive, my bro is probably in the best shape he could be in. He just got done paying off his credit card and his home equity line of credit...so he's good to go. Sucks that he just paid it off and now has a big bill...but better than the alternative.