Right, well testdisk has worked wonders in the past for me. It might worth a try especially if this is a spinning rust drive. It has helped me recover broken partitions and lost files so if you know where you’re looking you just might have a chance. I’m no expert but it seems like one of your last options with all the info provided. Best of luck!
Too bad these innovations wont make it down to the workers that stores hire from 11pm to 3am to clean the store parking lot across from me.