We were glad to find out today that Dad's internal discomfort in the stomach area was due to a blockage in his feeding tube! The surgeon tried several times to dislodge the blockage but was unable to, so he replaced the tube. That procedure was done right in Dad's room; he didn't have to go to an operating room.
Since the tube was replaced, Dad has been feeling much better. :-) We hope that he will feel like eating a little bit of liquid food again tomorrow.