How do I modify the url of uploaded media content?

Use a plugin like Deploy Helper. Essentially, it allows you to swap out all instances of one URL with another, and will also handle serialized data.

Just enter the old URL as media.detailsofmylife.net/uploads and the new one as www.detailsofmylife.net/wp-content/uploads.

Make sure you also reset your custom upload paths. If you’d defined constants like WP_CONTENT_URL or UPLOADS in your wp-config.php, remove them. Similarly, delete any possible settings in the database by loading wp-admin/options.php in your browser & emptying the values for upload_path & upload_url_path.