[cborsa7]

First, are you sure they are night terrors? I can't tell enough by your post if that's what is really going on. Looking at you time line he didn't seem terribly old when coming home, correct?
While these could certainly be issues from displacement it would be hard to say that without knowing what's really going on.
What is his normal night time routine? How do you put him down for sleep? Anything change recently? When he wakes crying can you describe the terror?

Hope you can get some suggestions, hang in there!