Good luck to you man. I feel for you.
Something similar happened to me before, but the extent of the damage
wasn't nearly as bad. I was working on my
Justice map one
morning, and when it was almost lunch time, the monitor just blacked
out suddenly. The computer turned off too. It turned out to
be a power outage in the city.
Usually, I save the map every five to ten minutes in Hammer, but that
morning, I was so focused on putting those models in the map that I
neglected to save anything. So I lost everything I did for about
four hours.
Ever since that incident, I press Ctrl-S every five minutes. In
addition, I save five or six copies of my map on different computers,
directories, and disk drives. I even upload it up to various web
storage services.
I hope everything works out for you, and I am looking forward to see the final product.
"The greatest thing you'll ever learn is just to love and be loved in return." -- Toulouse-Lautre, Moulin Rouge