I'm going to recommend giving your surgeon's office or your GI Office a call and let them know what's going on. ( I found that my primary doctor doesn't really know much about handling issues relating to the j pouch and I'm guessing the ER team is just about the same. ) I'm leaning on the side that you'll feel a lot better with an input from your surgeon/GI.
Praying you feel better and get some answers soon.