hard to believe

man, this is almost funny. so I just finished editing a paper, lots of changes, had it laid clearly with colors and notes, saved that file, saved another copy, removed my edits and saved that. Go to send both, and it turns out the 'edit' document is corrupted or something. it won't open. it's like the classic "my computer erased my paper just before it was due." but it really happened. ALL my major edits were on that page. Now they are GONE. Luckily, only the edits doc got messed up.. the final is okay. still that was important for being able to improve English, but hopefully the project is not sacrificed!! I was really careful to save separately, but still of all times, this is when something like this happens! WUT?