I think the problem can see what you was typing and they hacked your main ;/
If the account is hacked(Email changed) then the only way you're going to be able to recover it is by z8 support.
There is no way someone can find the registered email to your accounts password if they have no clue what the email actually is.
I'm pretty sure if you send z8 transactions from 2010-2011-2012 and most recent transactions then you'll be able to get i back.
You have your creation date, you may not know the 1st password used but you know a lot of the passwords and emails that were used on the account.
You can do an IP check, you can show that the same paypal(or credit card) has been used on the account for 2-3 years.
I use it on vmware and I change my account's password everyday so, I guess my account is safe :/