tastygiggidy

So i spent many hours on a map for the game I was creating. It took a VERY long time, and I didn't really save my project during the construction of the map. Anyways, when i finished the map, i looked at it with all it's glory, and there was a lot of space at the top of the map that i didn't need. No worries, I'll take off the top by removing the height (the amount of units I didn't need was around maybe 90? the map itself was 134. So I took off 90 from the 134, and wouldn't you know, it deletes everything from the bottom, not the top. So now, the hours i spent creating this map that i was reaaallly proud of, is gone. I tried the undo button, it didn't work. I tried control z, and it didn't work, I think i did everything possible to try to get it back, and now i just give up. there probably is not a way to fix it, but now I'm going to be unmotivated and stale to work on the game for another long period of time. can you update the program so you can undo things like this? the damage is done, but if i ever even feel like getting back to the game again, it would be nice to not have to go through that again. thank you, and respond back soon