OK! No matter what caused your problem, the priority thing is to regain your data back.
To recover your data, I recommend you to apply
Vimx Partition Recovery, which is specially developed to process the partition recovery problem, such as the deleted partition recovery problems, formatted partition recovery problems and other partition recovery problems.
Notice:
1. Stop writing anything new on the same drive to keep the inner data safe.
2. Save your recovered files on a different drive in case of recovery failure.
3. Create a new partition to replace it, if you like. (Create a new one like this: Right click “Computer Management” to select “Manage”=> Choose “Disk Management” => Right click the deleted partition and hit “New Logical Drive” on the list => format it.)
4. Back up you data well in the future as possible as you can.