Can't log in, have been playing for months

I was on one of my alternate accounts, and I got disconnected earlier. So, I tried to log on to my main account and it gave me the "the information you have entered is not valid..." prompt. I was pretty sure I was typing my password correctly but after enough tries I got a "Could not log you into world of ..." prompt. (Apparently it happens if you type your password incorrectly too many times.) So, I go onto warmane, change my password, and try to log in with my new password and my old password and I get the incorrect password prompt. My new password is no more than 12 characters long and my realm list is set correctly. Could anyone offer any help? Thanks.