If your Yahoo account is hacked, you will obviously be tensed as all your files, pictures and important documents that were in it are inaccessible. You would have also used that account to register on other websites. To know more about it so you need to visit on this link: Yahoo Account Recovery. The first thing that the hackers would have done is changing your password so that you will not be able to login to the account when the hacker is working on it. Then they might change all the important information like zip code, security questions, and alternate email ids. This is mainly to make the person not to reset the password using the Password Helper.