Facebook log in removed, can't log in

I've just seen that they've removed the Facebook login and it won't let me reset my password using the email address my Facebook is currently associated with.  I can reset it with an old email address which Facebook was originally set up with but no longer exists and I can't access, so I'm unable to log in on the website.

I am actually still logged in on the app, but all I can see there is my account name, not what email address it is associated with or any ability to reset it from there.  Any help would be appreciated