Marios Alexandrou on "want to link the posts on mywebsite back to it's own website where they live"

There's a plugin called Real-Time Find and Replace (I'm the author) that you might be able to use to change the domain of the links to match your site's domain. This plugin doesn't change the actual database content. Instead it modifies the page HTML before it is sent to the user's browser. So if you turn off the plugin, things go back to the way they were.