Do not do anything else to the disk until you have a plan of action. You might try File Scavenger or contact Que-Tek, who makes File Scavenger, about their recovery services. There are other recovery programs and recovery services. You can google for them. But trying a recovery tool, then trying a recovery service is your only reasonable path.

And then look into a backup package. You need to have backups of your files. A disk can drop dead at any point in time.