2 issues that jump right out at me in viewing the code;
1) IN the idFirstVisit parameter of the chkVisit recordset, you have a syntax error for the run time value:
$_SSSION['id']
instead of
$_SESSION['id']
2) In the update record behavior, for the verified on column, use the code:
<?php echo(date("F j, Y, g:i a")); ?>
instead of:
<?php date("F j, Y, g:i a")?>