I went through a similar experience about seven or eight years ago. In one day, I had to lay off about 150 employees - some that had been the first employees I hired when we started up, years earlier. It was one of the worst days of my life.
I'll tell you that life goes on. I licked my wounds for about two or three years, then started to build something new. I learned a lot in the process, and that made me much better prepared when the economy started to tank. Just hang in there, and know that life is long, with a lot of ebbs and flows.