Have you tried to recover your password? It'd send an email to the email linked with it, and if you can access the email, you can change the password.
If you think (and you have evidence) that your account is hacked, you may send a PM to theymos proving it is yours (PGP signature, if you used it on the account, or sign an address that belongs to the account).
I think there was a thread somewhere about it, but I can't find it right now...
https://bitcointalk.org/index.php?topic=497545.0If you are unable to recover your account through conventional means (email address), this seems to be your next best option. Hope things work out for you.