Have you contacted your host to see if they upgraded anything yet (PHP, etc..)? If you have access to your sites error logs, this would be the first goto place I would look. I am sure you will find some errors or warning there.
The white screen or “white screen of death” is nothing new and is a common error that happens mainly due to whitespace at the top of PHP files or closing PHP tags (?>) ar the end of a file. You can find more information on common errors at http://codex.wordpress.org/Common_WordPress_Errors#The_White_Screen_of_Death.
I did visit your admin page and there was a connection error to the database. This indicates that there may be issues with your config.php file (missing, corrupt or not readable by your server).
I would check your server log files first to see if it provides any new clues to what is happening currently. From there your can work to get your site back up and going. The alternative to this all is to contact your host and see if they can help.
Getting “Error establishing a database connection” Check your wp-comfig.php file once
