I think I would just say that he's having a crisis which involves quite a bit of depression and leave it at that or that's he's trying to find himself. You don't want to mention unresolved childhood issues because they will then not only connect the dots, but could very well turn on you.
BTW, how are you doing?
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
