Yahoo locked out


New Email
I havent been able to get into my yahoo email for about a month. Someone hacked into my acct in the middle of the night. A friend sent an email which picked up many of my email addresses and then sent it to many of my friends without my permission. Later I got an email saying my acct has been compomised. I changed the password and cant get back in now. I cant remember the question to prove who I am. I created this account but listed my acct as .....@yahoo not . I forgot to put the at the end. Is this what goofed it up or was I hacked into and cant get back now. I originally created this yahoo acct on my home computer so I should be able to prove this is me. But how do I do that?