Hi everyone !

I worked on a document all day yesterday and saved it last night. Only this morning when I opened it I discovered that a large part of the work had disappeared. All that's left is a section I'd pasted from another file (but it's not even complete).

Another thing I don't understand is that in the automatically generated 'layout' sheets, you can see a completely different drawing that doesn't belong there (I did draw this plan, but it was in another autocad file). 

How can I find all my work recorded last night?

Thanks for your help ! 

Here's what I recorded last night... (it's an old version. The drawing I'm missing looks like this but with modifications)

Here's what I picked up this morning ...