It's tough when you can't sleep and you're feeling awful, especially when the boards aren't that active in the middle of the night and there aren't many people to talk to. I'm saddened to think of you here like that.
I agree with Karen on the meditation....I use it, too, and it does help. Even closing my eyes and taking deep breaths, and focusing only on the sound of those breaths, is helpful.
There are also some really good relaxation CDs out there, and guided meditations on CD, and I pull those out from time to time to help me relax, too.
During the day, if you are up to it, try to get some physical exercise. Sometimes it's easier to sleep if you've had physical activity during the day, preferably in the fresh air.
One thing I would not suggest.....and I'm guilty of this myself at times.....is using the computer when you are trying to get tired and go to sleep. The light of the monitor shining in your eyes is very stimulating to the brain, according to what I've read, and is a signal to our bodies to be alert and awake. I have tried it both ways, and I really believe there's some truth to that.
Good luck with your sleeplessness, and please let us know how it goes.