I have made a huge mistake in maya. Pleaese help!!

well i have been painting weight tools onto my models skin which took me ages. I used the mirror paint weight tool to copy the paint wight onto the other side of the model. the back legs we working fine so i did a stupid thing by saving my work. When i began to move the front legs around then they began to deform badly. So now i cant even go back and undo the mirror weight and i dont even have a back up file. So i am pretty much suffering now because i might have to start this all over again from scratch.

I was just wondering if there is any thing i can access in maya which will go through the history and be able to undo the mirror paint weight tool mistake. Thankyou

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