I can understand it.
I was never a child who had to phone home or things like that.
As an adult I've developed panic disorder and agoraphobia. I occasionally have to travel for work, and it's great for the first few days, and then the excitement wears off and I just want to go home NOW.
Perhaps if I worked on something the magnitude of the world cup, it might be different. But then again, it might not.
Didn't Marcus Trescothick go through something similar?
It may be being labelled as 'home sickness' but it could be something a lot more than that