Synology DS116 (1-bay) drive failed --- am I totally screwed ??

The Western Digital Red SATA drive in my Synology DS116 is no longer functioning. I did a reboot of the NAS and there were some strange clicking noises but they went away and the Disk status LED is static green so the drive should be OK, right? However, the Synology Web Assistant keeps telling me there is no drive detected after I hit the Refresh button many times. If the drive is defective, then I should see a static orange LED for the DISK status, according to the user manual. What the hell is going on?

I'm having a mental meltdown because I had about 500 home movies from my family archives transferred from videotape and I didn't have any backups of these files --- they were ALL stored on this NAS drive :-(