I change my general setting url and blog url incidently now my blog is not any more. Now i can not access to wp admin area
use the wp db backup plugin and back up regularly then you can recreate the blog from scratch, this is the most complete method otherwise export your posts etc and start from scratch that way
I am using db backup plugin but that time i was not getting access to admin area. building new blog takes time even have backup files
If you changed the WordPress Address (url) in the general settings menu and want to change it back I just did a post on it. Also look at the comments, one of the readers posted a different method that may be easier for you: http://www.wordpressmax.com/wordpress-guide/changed-wordpress-address-cant-login
yeah i know i can fix all the issues in db but there was some problem with my browser so i can not access my cpanel