Can't login to AT&T account - can't even get a text message with a new password

Hello,

I'm in the pretty bad situation. I study in the USA, but I'm back in Europe for a summer. I needed to get a text message on my AT&T number with a verification code for one of my apps, but text messages don't work over here for prepaid plans. At least I was able to log into my account, even couple of days ago, but suddenly I can't. It says wrong password and I don't know why. If I was in the USA it would be easy I would click on 'Forgot password' and get a text message with a new one, but I can't because text messages don't work here. What can I do?

Thank you