Overwritten partition

[hallexh at gmail.com]

Hello,

I accidentally overwritten first 40GB of 36TB XFS partition. I ran
xfs_repair then, which resets the superblocks (I'm sorry i didn't copied
the output of it) and after I mounted the partition, there was no files.
Empty file system, but It should be almost 90% full.

Am I really screwed or there's a chance to recover the data somehow?

Thanks anyone for helping!
John