Holding Pattern

So, late tomorrow night (tonight I suppose, but in reality early Friday morning) my girl is starting off on her journey to Japan with her dad for most of the month. It's kind of freaking me out. (Kind of might be an understatement.) She is going with her father and staying with her grandparents and rationally I understand that it's highly likely that everything will be fine, but the non-rational part of me is not happy that my only baby is going to be so far away from me on the other side of the planet. I'm not handling it particularly well and I'm afraid I'm going to eventually turn into one of those wacky basketcase empty-nest moms when she finishes high school and leaves for college.
When I was going through the divorce I was really afraid my ex might try to take her back to Japan, in which case I would have been screwed because Japan basically condones parental kidnapping by Japanese parents. (See here if you really want to get into). It obviously didn't happen but it was a huge fear of mine for a long time. My girl is no longer the compliant little buttercup she used to be. She's about to become a high school freshman and has that "kicking ass and taking names" attitude some kids develop at that age. (It can lead to recklessness, but it can also lead to not taking anyone else's shit, which I think is good in this situation.) I'm pretty sure one within one day her grandparents will start lamenting that she will have to leave them at the end of the month and they will do that emotional pressure thing they are so skillful at, where you feel like you should sacrifice your own interests because they're old and will be sad. (Well, I got sucked into that whole thing WAY more than I ever should have, but maybe that is just me.) I've made sure the girl has the information she needs to get help from me and several other people she can count on, if it comes to that. I'm even going to be in Japan myself for about half the time she is there. And yet, I'm still holding on to something that keeps me a twitch away from breaking into tears at any moment.
I'm mostly trying to cope by incessant internet surfing, watching stupid tv and knitting. (Kind of like a self-induced stupor without substances.) I break that up with yoga, trips to the gym and walking the dog. I feel better if I don't talk much and my appetite is pretty much shot, but that's good because it's helped me drop about 3 pounds and if I drop a couple more before I go then I will have reached the high side of an "acceptable" weight versus the actual weight I have weighed since about last summer, which is 5-10 pounds on the unacceptable side. (And which is not even all that terrible or health-threatening or anything. I just don't like those numbers.)
So, now that I've shared probably too much info, I guess I can go to bed. I think I've been staying up so late because it lets me sleep in later in the morning. This stupid wet, gloomy, sunless weather isn't helping me much either.