Thanks to all who provided guidance and support. A call with the (better) GI in the local group last night ended with a recommendation to try a dose of Miralax in the morning. It worked. Still sore and will stay on clear liquids a while more, but the Miralax did the trick to clear the area of obstruction, I think probably entirely.
If I get any further insights on this from Dr. Shen's group will post here. But for now - another survivor.