a document I was working on has just disappeared from icloud drive

I'm in a total panic. I've been working on a document for the past week, updating it between my mac and iPad. A moment ago, working on the iPad, a message came up saying that the document couldn't be auto saved and my most recent changes might be lost. The only option was to close the document. I did this and now it has disappeared from icloud drive completely. I wouldn't mind if I'd just lost the last 2 hours - but this is at least 24 hours of work. Does anyone anywhere have any ideas on where it might be? Because I'm on the move I didn't back it up on my Time Capsule as I normally would. I think I'm going to cry - I have a deadline of Saturday.

Thanks for any advice.

WG