Deleting unused assets glitch

I was deleting unused assets in my project and I wanted to delete all unused assets so I selected it all and pressed delete unused assets, when it glitched and made my project into only ten repeating images with no audio. But the "used". Assets stayed in the asset library. The project took a year and a half, if I don't get it back I will be very angry, please please helps. There is an image attached to this of what my project became.
