Urgent - I think I just lost everything on my MacBook Pro. Hard drive won't mount and booting up shows "no" symbol

My MacBook Pro (13" mid 2010, Yosemite) doesn't feel like booting up. It gives me the no symbol after the progress bar is about 1/4 of the way through.
Additionally, it won't mount in the Recovery HD. It shows up as disk0s6 and clicking Mount does nothing. Can't seem to mount it in the Terminal either.
The disk partition is encrypted, so unfortunately I can't pull the hard drive out of my MBP and pull the stuff off it with my PC.
I tried First Aid - "no problems found" (such LIES!)
I tried PRAM - didn't work
I tried Verbose Mode - went fine for the first minute, then hung for a while before returning to the "No" screen and in the bottom right corner "Still waiting for root drive".
I tried SMC - didn't work
Most recently I did install rEFInd - which is a boot manager. I was afraid it screwed up the EFI partition -seemingly not, as it will boot to Recovery and external drives.
The data still seems to be there, but the OS is having trouble accessing it.
Do you know what would be causing this? I really need that data back :/

It appears I can unlock the partition, using diskutil via the Terminal (diskutil coreStorage unlockVolume <UUID> -passphrase <passphrase>).
However the volume doesn't have a UUID. It lists the partition type as "FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF" (which is a UUID) but using that doesn't work.
Additionally when I use diskutil coreStorage list, it comes up with nothing. I'm at a loss here, the partition doesn't even know it's own UUID or that it's encrypted. It seems quite damaged to me but I don't have the slightest idea why, as I CAN boot to it and enter the password but it will stop at the "no" symbol part of the way along.

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