Although I spent a great deal of time with my "L" when he was young, there were some periods, even extended periods, of time when we were separated. The extended period lasted a whole year. As I recall I was miserable at first, and then I did find ways to deal with it. Most of it was just assuring myself that he was ok and that I was ok without him for that period of time. I won't kid you, though, you never completely get over the separation. For me it was like this overwelming feeling that something very important was missing from my life. Of course I knew what that something was, but the actual feeling was quite strong. I would go through times of depression, sometimes pretty bad depression, but I did manage to get through it. One thing that really helps is to have good, supportive adult friends. Even if they don't know that you are missing your YF, their friendship will help fill a lot of gaps. That and stay in prayer. Will you be able to call your YF or e-mail him or something while you are overseas? That could help a lot.