Update page when JSON feed is updated

I am new to Drupal. I am using Drupal 7. I have inherited a custom module that uses a JSON feed to populate events on a page. The issue I am having is when the JSON feed is updated the node is not being updated with the updates. For example, if a title has been changed to an exisitn event, how can I get that to update the page? Any input would be appreciated.

  $refresh_days = 1; // refresh the feed every xx days
  $time = time();
  $counter_new = $counter_existing = 0;
  // make sure its time to run
  $last_run = variable_get('gd_feed_last_run', 0);
  $next_run = strtotime('+' . $refresh_days . ' day', $last_run);
 // if ($next_run < $time) {
    // make sure we have right category; get tid
    $category_matches = taxonomy_get_term_by_name('gd', 'events');
    $category = array_pop($category_matches);
    if (!$category) {
      watchdog('gd', 'none found', 'error');
      return;
    }
    $feed_url = 'https://lathis/gd-forms/api/v1/yhe';
    $options = array('headers' => array());
    $options['headers']['Authorization'] = 'Basic ' . base64_encode('ghytt:gduyw48fjienfn39o439ihA==');
    $response = drupal_http_request($feed_url, $options);
    $response_data = $response->data;
    $json_data = json_decode($response_data);
    $feed_data = $json_data->deals;
    if (!count($feed_data)) {
      watchdog('gd_feed', 'bad feed request - ' . print_r($response, TRUE));
    }
    foreach ($feed_data as $event) {
      // make sure it doesn't already exist
      $event_nids = FALSE;
      $query = new EntityFieldQuery();
      $query->entityCondition('entity_type', 'node')
        ->entityCondition('bundle', 'event')
        ->propertyCondition('title', $event->{'draftTitle'}, '=')
        ->fieldCondition('field_event_dates', 'value', strtotime($event->startTime) , '=')
        ->range(0, 1)
        ->addMetaData('account', user_load(1)); // Run the query as user 1.
      $result = $query->execute();
      if (isset($result['node'])) { // existing event found, just count it
        $counter_existing++;
        
        //assuming what I need goes here to get the updates

      }
      else { // event doesn't exist; create new one
        //create new event - wont bore you with this create code. it works
         $counter_new++;
        $node = new stdClass();
        $node->type = 'event';
        $node->language = LANGUAGE_NONE;
        node_object_prepare($node);
        $node->status = 1;
        $node->promote = 0;
        $node->sticky = 0;
        $node->comment = 0;
        $node->uid = 1;
        $node->title = $event->{'draftTitle'};
        $node->field_event_category[$node->language][0]['tid'] = $category->tid;
        $node->field_event_dates[$node->language][0]['value'] = strtotime($event->startTime);
        $node->field_event_dates[$node->language][0]['value2'] = strtotime($event->endTime);
      
        node_save($node);
     }      
}
variable_set('gd_feed_last_run', $time);
}