I'll bet he is glad to be home.
Folks who have not done something like this often fail to appreciate some of the challenges.
First and foremost is the simple stress of being somewhere DIFFERENT. Sure, language and clothing are obvious differences ... but just as unsettling are all the 'little' things: the sound of the telephone ring, the look of the money, the product packaging at the market.
Looking over a few years of experience in that sort of adventure, my observations seem to suggest a pattern to the 'freak out' responses of people: upon landing, after one day, after one week, and after about 3 months ... these are the time points where folks seem to go into panic attacks. Oddly enough, it seems those most 'successful' back home are most at risk. Trying to recreate 'home' often seems to make things worse.
When you get back home, there's a repeat of the process. You're no longer 'in tune' with the current trends; you have no idea what was on TV last week, or who the latest pop stars are. After years of planning for that McDonald's "Big Mac" when you returned, you enter McD's ... and order chicken. Go figure.
