I couldnt get onto our bitcointalk account in December which I thought was odd as I hadnt changed my password, so I had to create a new account to may anger as I had been using that account for 4 years and was a hero member. Then a month went past and the same thing happened to my brother. So I started to investigate. I looked up my old account and it was been used daily by someone else! I had had my account stolen and so had my brother.
How is this possible? Is this an inside job by bitcointalk?
Go visit the meta section there are many complain about hacked account not just you. You just need to provide proof of ownership to get back that acct if you already have staked address you can use it to sign a message and send it to admin .
And by the way here is the thread that can help you to recover your hacked acct
https://bitcointalk.org/index.php?topic=497545.0 just follow all guides given there.