This happens from time to time, unfortunately. The good news is we can now restore your site to a recent backup. You will lose up to 1 day's updates, but you'll get your precious page back!
Just email firstname.lastname@example.org, tell us what happened and we'll do the rest.
Note: If you happen to have made LOTS of changes within the last 24 hours, it's probably better to recreate the missing page (Help available on this site on how to do that)