Hey Bella,
I don't have much wisdom, and I am responding to your post which is now nearly 2 months old, but thought I would let you know you are most definitely not alone in feeling like this.
My brother and I went to boarding school in England, but our parents live abroad-- in 2 different countries-- and we
still always cry when we say goodbye!
It seems that the goodbye part doesn't get any easier and the heart strings tug as much as they did 15 years ago, but perhaps we are all better at staying in touch?
The week after a nice time together is a time to keep busy. Also a good excuse to treat yourself to a manicure, or a new sweater or something!
It's been a lot easier for my fiance's parents to cope with him living in London (they are in California) when they know when they will be seeing him next.
You don't say where you live, but is it possible for you to perhaps visit your son more often? You only mention that he visits you. February, May and November are the cheapest months of the year to fly, and if you book up far enough in advance you can get some fantastic deals! Here's a tip: not suggesting that this is necessarily the only airline, but when it comes to comparing the cheapest days and times to fly, British Airways' website has a comparison chart. Anyway, it gives you a good idea of what the cheapest flights will be across all airlines.
I hope by now (September) you are less depressed, and that you feel less alone.
Here's a big virtual hug!
HUG![/color]
Flaurena