I'm a big believer in the idea that sometimes, you've got to feel the way you feel until you don't feel that way anymore.
In other words, if the feeling is that big, then you should go ahead and wallow in the feeling for a while. We're all allowed.
I think sadness, especially over being separated from family and friends, is a big deal. Don't get me wrong, it took me years to get over my family. I was terribly sad and depressed over it. Now those feelings have melted into an emotional scar that no one sees but me. But I know it's there.
One of my therapists told me once that the feelings of anger and sadness I felt about my family would always be there till the day I died. The trick, however, is that the more I dealt with it, experienced it and moved past it, the smaller the feelings would become. I've found that to be true.
I think the same holds true here. It's very natural and "normal" to feel deep and long lasting sadness over loss. I submit it is better in the long run to face it, go through the experience (and that means feeling really bad for a while) and then healing begins on the other side.
Hhhmmm, I hope this doesn't sound like a bunch of psycho-babble. I do get to rambling sometimes. I also re-read my original post and I want to make it clear that I am not trying to diminsh jwbot's feelings (or yours teejay). I really hope it didn't come off that way. I was only trying to share a bit of my experience.
Bottom line, it's not an easy situation to get through.
Chris