That he did. Even with all the luxury that the King while flying to the Caribbean, it's still a long flight. Yes, he's still has cancer treatments, but with the messes going on in the UK and internationally, he has all the work to contend with even though he's not the leader of the nation, the Monarch still plays an important role.
Then there's the family and we all know the three culprits, there is some controversy or scandal nearly every week or two. That's a lot of pressure.