Dynamic_sidebar inside wp_nav_menu

You can add extra items in menu like

add_filter( 'wp_nav_menu_items', 'your_custom_menu_item', 10, 2 );
function your_custom_menu_item ( $items, $args ) {
    if ($args->theme_location == '[YOUR-MENU-LOCATION]') {
        $items .= '--YOUR EXTRA STUFF HERE--';
    }
    return $items;
}

Hope it will help!