Thank you. I followed your troubleshoot link to another troubleshooting link on that page called "Beginner’s Guide to Troubleshooting WordPress Errors." That page told me to try deactivating plugins from the FTP thing (since I can't access the page editor) by changing plugins to plugins.deactivate. Then I tried editing my page again and it took me to an update screen. I updated and now it works again. Thank you.