Hey JP, sorry to hear you're going through this. Similar happened to me years ago when the hard drive in my writing computer died unexpectedly. Like vern, I was able to get most of it recovered by paying a technician to do it.
That experience taught me the value of buying a small external hard drive that I used only for back ups of my writing files. I DID NOT leave it connected to my computer and only took it out once a week to perform back ups. To preserve day to day edits, I used a simple thumb drive which I would erase each week after a successful back up to the bigger external drive.
It's a laborious thing, but is the only safety net that's virtually fool proof. And thanks to the fire proof safe I bought, even if my home goes down in flames, my writing won't because that's where I store my external. 
Edited to add: the reason I stopped keeping my external connected to the computer was I ALSO had an external hard drive go bad once too from keeping it connected and 'on' all the time. They also don't handle power surges well either. Safest bet, connect--back up files--disconnect and store. Personally, not a fan of cloud services for storing writing. None of those services are guaranteed to be there forever.