Last post crashed my server!! cant get it back online .HEEEEELP ME !

just published a post and my server crashed, i still can access cpanel but not the wordpress blog https://www.dailymobile.se

what can i do???
how do i undo the last post i published?

is there any safe mode option that i can login and delete the post?
plz help me!

error message:

Internal Server Error

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

Please contact the server administrator, [email protected] 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.