Probably best to just bite the bullet. It's rough, but not much can be done. I know where you're coming from though. When I was playing NBA Street Vol.2 my memory card got corrupted at some point and I had to reformat mine. (Embarrasing that my own company would destroy my memory card) Anyhow so I lost my finished Zelda save, my completed ED game with everything (and I mean everything), Metroid Prime finished save, Mario Sunshine... etc. etc. etc.
Just go buy a new one and suck it up. It's all that can be done most likely.