At the top of the page, there’s probably a loop that displays the page header. Inside that loop, include the code
$this_id = $wp_query->post->ID;

… Then put the category stuff …

At the end of the page (before the closing DIVs, get_footer(), etc.), put

if ( $thispage = $wpdb->get_results(“SELECT ID, post_content FROM $wpdb->posts WHERE ID = “.$this_id)):
echo $thispage[0]->post_content;

endif;

Caveat: WP 2.1.2 and I don’t pretend to understand much about the WP programming model — I just find code that works and copy it to a new context.