Can't access /wp-login.php and account shows no blog

Hi folks, our blog has been up for a few years, and today when I went to our site http://www.jwjsf.org I got the error message “The requested URL / was not found on this server” I also got the same message for /wp-admin and any other link for our posts. And same msg for /wp-login.php

I was able to login to my account using the wordpress.com site and my email and password. But when I went to “My Blogs” it says I don’t have a blog and to create one.

What happened and how can I fix it?

I made no recent changes to the blog, no new plugins or themes and site was working fine yesterday. I did update my billing information on Google Admin today and for awhile it said domain registration suspended and now it says active (but site still not working).

I don’t think it was ever backed-up, where should I look:(

Also just read about brute force attacks, if this is the issue, what can I do now that the site is down?

Thank you!