How do you Undo and Undo?

I was making a skin for an important project, when my computer stalled. I clicked the “Undo” button to undo a mistake I made, and my computer stalled so I clicked it again. My whole skin reset to nothing! It is gone, and I worked all day on it. Is there a button or way to redo and undo? Please help, this skin was for an animation and I don’t want to start all over from square one. It took me forever!

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