Changed my web address HELP!

Hi last friday I spoke to godaddy who host my blog site and changed my address from http://www.sallyslackblog/wordpress.com to http://www.sallyslackblog.com. Godaddy assured us that doing this was very simple and wouldn’t create any issues. Since doing this it’s been a nightmare and my admin platform no longer seems to speak to wordpress, my site stats are down, the mast header slideshow doesn’t work and the sliding sidebar widgets don’t work either, any thoughts would be greatly appreciated!