Some suggestions:
1. Take up a new interest. Join a club. Volunteer time. Just get youself out of the house and away from your misery. Making some new friends will help you get your sense of self back and that is extremely important.
2. Do you have a support network (like friends or family)? If so, go to them. They may not be able to do much but just knowing that they're listening can help a great deal.
3. Clean your place--dust, vacuum. go through everything and downsize. It's not fun but it's something to do.
I remember when my Signifcant Other (now my husband) moved away. He got a job ahead of me and we were apart for six weeks (it just worked out that way). I thought I would die. I was working at the time and that helped a little. Each day just went past and I visited him when I could (a couple of times).
Right now it's been five days and you're five days closer to the time you can see him again. Try and find something each day to celebrate--a beautiful sunrise or sunset, a bird singing, the clouds going by. If you can find joy in small things you'll be able to find joy in larger things over time.
The most important thing for you, though, is to cooncentrate on YOU. Yes, it's nice to think about him but don't depend on him for your happiness.
Good luck and keep posting.
P.S. You could always read _War and Peace_ or a James Michener book.