So my Twitter has been hacked....

I woke up this morning to find an email saying that someone changed the email address and password on my Twitter account. It wasn't me. I have sent Twitter an email about it and hopefully they will be able to do something but it doesn't look good. It says in their auto-response email that they are unable to change passwords or email addresses. So basically because I don't know the email address associated with my account, I can't use my account anymore. There goes all the hard work I've done over the last two years. I had 4000+ followers that I will probably never get back. My question to you is: has this happened to you before? Did Twitter help? I'm seriously freaking out here!