Someone got into my account

So I didn't log for two days and today that I logged again I noticed that someone entered my account because I had like 30k of gold removed from my account and there were a lot of other valuable things removed from it, I didn't have the 2 factor authenticator thing activated but I now have and I also changed my password but I don't even know if that's enough to prevent this from happening again, and I wanted to know if there is a way to know when did this person logged into my account and what exactly did he took because I had lots of things and I obviously can't remember the exact amount of each item that I had. I've never shared my password or any other information with anyone so this was obviously unexpected.

About gold check this: http://forum.warmane.com/showthread.php?t=430433

About items it is your responsibility to protect your account.

It was recently mentioned that from another wow server informations was leaked,
so if you have the same username and password on warmane and on another servers, that's the reason.
no one can give you back your items, you should have turned on 2fa before