Can I revert to a previous version of an Amazon listing? (Flat File Fail!)

I just tried to edit my listings using a flat file but it messed up my listings. Does it take a while for changes to work properly or is what I have now (all children showing as inactive/out of stock and not appearing on search) what I should expect to see in 24 hours? If so, is there a way to undo all the changes I made? I tried to upload the original category listings report but that is showing with errors now too and not fixing the listings 🙁