The drive was probably failing in the first place. If this is the only copy of your files, it is probably best to get into a data recovery professional for an assessment.
To use our services, you can start by creating an account and new ticket on our support site at https://support.recoveryforce.net
If you aren't concerned about the risk of killing the drive and making it unrecoverable with DIY efforts, we'll need to know more about the drive, the model and what was done up to this point.