It is no doubt too late to be of any help, but about three days after being discharged from the hospital I experienced severe upper abdominal pain. The diagnosis was pancreatitis, based on an elevated lipase enzyme. I have had regular screening including endoscopic evaluation and MRI. The only results are signs of calcification in a few spots within the pancreas. There was a debate among the specialists over whether this was GBS related that has never been settled.
If you still monitor the board, I would be interested in how your husband has fared (well, I hope), and whether there was ever any development as regards the pancreas.