I'm sorry man, this sucks. I always tend to keep a bank pin and bank everything now Free trade is back, but hopefully i will never experience a hacking.
Try to run malware antibites, and see if you were keylogged or RAT'd.
If not, try to think of other alternatives such as if you bought the account, the original owner, maybe your password was too easy.
All in all, i'm sorry, life goes on though, it's a pixelated game, who cares at the end of the day. Don't worry too much about it really. Live your life.