Moving to another country is hard even when you speak the language. How long have you been there? There is a general rule that the end of the third month is the pits. You have pretty much identified all the problems but don't really know how to cope yet. There is a 'teach in Japan' program that maps the whole experience out for their teachers. They tell them exactly how they will feel at the end of week 1, week 2, etc.

It will pass, really. Looking for contacts from home is a good step. It also helps to make a real effort to do some sightseeing, to remind you that this is an interesting thing you are doing.

Also, socially, accept all invitations, atten all events, even if they aren't the sort of things you normally would do. It helps.