So far, so good...

Well, Dad reported that he was feeling much better today and hadn't had so much pain as over the past few days. It may be too soon to say whether it's the decision to avoid milk that is making the difference, but the results are pretty promising so far. Dad was pain free for most of the day, except for some discomfort in the evening after eating a little dinner.
The nurse told us that the surgeons continue to be pleased with the progress of his wound (even though it will still take a long time to heal because of not having any stitches in it) and it's possible that Dad will soon be moved to a different ward - a rehabilitation ward for people who are no longer dangerously ill and whose recovery is likely to be a slower process rather than of short duration.