I can’t edit my post!!

At first, I was getting an error when I tried to edit my post in “Visual” view. But I could still edit it in “HTML” view. But, now I can’t edit it at all… am getting “Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 102401 bytes) in /home5/rachelm0/public_html/wp-includes/general-template.php on line 1524.” The post is still showing live at http://www.rachel-levy.com/confused-by-all-the-twitter-programs/

How can I edit this?? Do posts have max sizes??