you may be able to get it back, but if it's impossible the only thing you can do is let it go.
I lost a hard drive with more than 10 years worth of musical,artistic, writing and general creative projects. It was a friend who thought he understood computers, he tried unplugging the hard drive while the computer was running and killed it. I just turned and looked at him and it was too late, he'd already unplugged it.
turned the comp back on drives gone. My first thought was that I was going to kill him. but then I felt dizzy at the sheer volume of work that had just been lost and I just went calm. I felt as though my Lifes blackboard had just been wiped clean. the new space was the only thing that kept me from losing it.
I've lost work on another hard drive since but non hit as hard as that one.
Now i use an external hard drive and dropbox for important projects.
but still, I feel your pain mate.

- to data no longer with us.
Sometimes I like to use words out of contents