Wow. That is just ... wow. Awful. I am so sorry! I don't know what I'd do if I'd lost so many precious memories. I hope you can recover them somehow.
Back in October my computer crashed and would not restart. Period. I tried everything I could think of. Fortunately my brother (my own personal Geek Squad) found a way to boot from a disc using Ubuntu and I was able to transfer over 90% of my files to flash drives before having the stupid thing rebuilt. Maybe something like that would work for you too?
I hope so. See what your brother can do, I guess. That is so frustrating and devastating and ... urgh. Major hugs and pity from me. What a rotten thing to have happen!