Hacked

Looking at the account, Eonicle, I see that you were able to regain access to it. At this point I would like you want to make sure you take the necessary steps to secure your computer and recover any missing items.

• Computer security, should be a top priority. If your computer is infected with a keylogger, your account information can get out regardless of how creative your password is. Run multiple virus scans and remember that there isn't a single anti virus program that will catch every single virus out there.
  Secure Your Computer: http://us.blizzard.com/support/article/30805


• After securing your computer, change the password associated to your battle.net account and personal e-mail account. Make sure your battle.net password is completely different than your e-mail password.
  Secure Your Email Address:http://us.blizzard.com/support/article/30806


• Once you are comfortable, log back in to the game and open an in game support ticket.
Contact In-Game Support to Report Any Character, Item, or Currency Losses:http://us.blizzard.com/support/article/30807

It is important that you continue checking your system for additional malware to prevent future compromises.

In addition to computer security, you may wish to look into obtaining a Blizzard authenticator for your account.
Battle.net Authenticator FAQ - http://us.blizzard.com/support/article/24660

Battle.net Authenticator (United States) - http://us.blizzard.com/store/details.xml?id=1100000822
Battle.net Authenticator (Canada, Australia, New Zealand and Latin America) - http://us.blizzard.com/store/details.xml?id=1100000823