I have same experience as yours. I hope somebody can help us here. I have access issues on the following:
1) I can't access my cPanel! My userId and PW was successfully logged in when an error immediately prompted saying: security token in your request is invalid.
2) I'm trying to access my website and all I'm getting is "Error establishing a database connection" when few hours ago I was getting a "504 Gateway Timeout" and now "Error establishing a database connection". WHAT'S HAPPENING?!?!
3) I'm trying to login to my wp-admin to check if there's something wrong there but again like item#2, few hours ago I was receiving "504 Gateway Timeout" and now, these meesages:
Error establishing a database connection
This either means that the username and password information in your wp-config.php file is incorrect or we can't contact the database server at localhost. This could mean your host's database server is down.
Are you sure you have the correct username and password?
Are you sure that you have typed the correct hostname?
Are you sure that the database server is running?
"Error establishing a database connection".
Crap! Please enlighten me here. I'm not a techy guy so I have no idea where exactly I should be going when in the first place, I CANNOT ACCESS ANYTHING right now! Please HELP!!