I would suggest that using ftp you delete the current Wordfence folder in your site's plugins folder, and re-upload a copy from the repository. Then delete your existing site htaccess and upload your backup htaccess taken before you enabled Falcon. This should get you access back into your site with Wordfence enabled but not running Falcon caching (note that Falcon does not need to be enabled to ensure security protection and is mostly focused on caching performance). It also sounds like you should create a new user, give it administrator rights and then delete your old admin username. Finally, setup the login lockdown parameters in the Wordfence options to lock out users who are making repeated failed login attempts.
Good luck!