@skeletoncrpse Hi. Sorry to hear about this. In these cases we have a guide to cover most potential solutions, but there I won’t sugar coat it there’s only very few cases where you can recover your work.
Basically when a file is corrupted you can either lose:
- Just the “main” internal file that hints the program how the images should be presented in the software, as well as some of the drawings. This is where most people can recover part of their work by following the guide.
- Everything else. The file is done for.
The quickest way to know if you can recover something is to make a copy of the file, change the format extension and open it with a ZIP file manager (all of this is explained in the guide)
If the Zip file manager does not show anything, it’s most likely that your file is unfortunately lost.
You could try the last part of the guide that deals with file recovery software, similar to those use by IT ppl, but I’ve never had a partial recovery that’s successful with it, since it mainly depends on the timing of the corruption 
Digital artwork and animation software at large will always have this issue, and from experience I always recommend forming a habit of saving multiple extra copies of the animation. If you work 30 days, you should at least have 30 files, one per day. Sometimes it can be a blackout, a faulty hard drive, or an operating system update. One never knows what can trigger the corruption of your files.
I hope you can at least recover some part of your work. Good luck.