Could be a number of reasons,
But as you say it's something serious enough to him that he's felt he has to leave the world cup to handle
All the rest of us can do is wish him well and hope whatever it is is sorted in a good way
Did you miss the bit yesterday where amongst his other oaths Charles ceded all the revenues from the crown's properties to the treasury in return for the sovereign grant
the crown retains ownership of those properties in name only,
Not sure you could say the same of the George's and bar the one who went mad, they went on for a while
Interesting addition to the bloodline was the queen mother, who had a couple of close relatives that went mad did she not