If you can get in over FTP then edit wp-config.php
define('WP_HOME','http://bjj.iamrobbiegreen.com');
define('WP_SITEURL','http://bjj.iamrobbiegreen.com');
Or you can change it directly in the database. Prefer the first method.
You may have server level configuration issues though. Its hard to tell. Resetting back to the original URL should at least get you back into the site. Then you can work on migrating the site.