Tried Changing Domain Name but Internal Error

Hi,

I tried to change the domain name of my website (had a theme and a plugin) so the first thing I did was go into settings and changed the domain name there. But now that I login to WP i get this error:

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@helpfundhealth.jankypatel.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

Another thing I did try was to ftp change my wp-config file to these two lines of code:

define (‘WP_Home’, ‘http://www.jankypatel.com’);
define (‘WP_SITEURL’, ‘http://www.jankypatel.com’);

and reupload but that didn’t help.

Any help or advice since I can’t get into my dashboard anymore!

THanks!