My Blog went missing!

Do you have backups of files and database just in case?
Did host change anything?
Can you login to your blog admin?
If you can login, what happens if you change themes?

Did not change hosts, my other blog (same host, different subdomain works)
I have file backups, will work on DB.
Can’t login…

ANytime i go to a WP page like wp-login.php
I get a blank page, no error…

Didn’t ask if you changed hosts, but rather did you host change anything?

Might try uploading a new set of WordPress files.
https://www.ads-software.com/download/release-archive/

Host did not tell me they changed things…
I would have assumed it’d affect my other WP installs on the same server.

How can I find out which release I was using before?

wp-includes/version.php if it exists.

Of course you can just Upgrade to the latest version…
Upgrading WordPress

OK, upgraded it the hard way…
installed the new one,
then manually imported few tables… seems to be ok…