Well, some stores feature a service that can recover all files from a disk with almost no importance about its status. But it could be a little expensive. I had an old computer that was wacked out in almost every piece of its hardware, and they were able to retrieve all the stuff I had on the disk, and placed it on a DVD (That disk was only capable of storing 4 GB... Like I said, and old computer). Luckily, the person who made this service was a friend of my parents, so it wasn't expensive, but they could charge you a huge amount of money (or not).
Every once in a while, on TV, I see some documentaries about criminals that tried to burn their hard drives, to hide incriminatory proof, and after a while, the police was able to recover what they had on the burned drive.
So everything you have is still retrievable, but will it be easy? Good luck.
Alternately, you could try to open your computer and check if there are no loose wires touching the hard drive (that could explain the clicking) and clean the dust.
