my account was completely depleated? All emails, Contacts, drafts, etc?

[Arthur Dent]

Sounds like your account was hacked and that the hackers deleted the contents of your account. Hackers make changes to your account settings that can direct your incoming emails directly to your Trash folder or forward your emails to a different email address. The following articles can help you recover a hacked account. Pay particular attention to the last two articles for info on resetting account settings and restoring deleted emails or contacts.

How to tell if your account was hacked - https://help.yahoo.com/kb/SLN2090.html?impressions=true

If you think your account was hacked, the first thing to do is to immediately change your password - https://edit.yahoo.com/forgotroot/

If you're unable to change your password, open the first link and click the "Contact Customer Care" link under the Quick Links section to the right of your screen. This should open the Yahoo Help form.

The selected product should be "Yahoo Account".

"Under Topic" select "Hacked Accounts"
"Under Sub-topic" select "unable to verify my secret question"
"Under Recommended options" You will see the options - Call Us and Email

Clicking on the Call Us option reveals the Yahoo Customer Care number

Toll Free US : 1-800-318-0612 24 hours a day, 7 days a week
International: 509-797-6330

Clicking on the Email link opens the Contact form. Complete the form as directed. If you don't remember your Security Question or Security Answer enter "unknown". Yahoo will use the information you provide to verify you are the actual owner of the account. If they can't verify your information it's unlikely you will be able to recover your account.

If you use your Yahoo password at other sites you will need to change the password for those sites as well. I recommend using a password manager like Keepass or LastPass to create and store strong unique passwords for the sites you visit. You can also save notes like your secret questions and answers to the password entries. LastPass can automatically log you in to any web site you have stored in its database.

I would recommend that you change your secret questions and answers also.

Changing your security questions - https://help.yahoo.com/kb/mail/SLN2031.h...sions=true

To learn more about protecting yourself online - http://security.yahoo.com/

Make sure your anti-virus is up-to-date and run a full virus scan on a regular basis.

Safeguarding your Yahoo! Account - https://help.yahoo.com/kb/index?page=con...OD_MAIL_ML

Activate Second sign-in verification
Sign in to Yahoo! Mail.
Click the gear icon in the upper-right corner of the window.
Click Account Info
You will be required to enter your password for security purposes.
Under "Sign-in and Security," click Set up your second sign-in verification.
Follow the instructions on the screen to complete the second sign-in verification setup.
You can either:
Use either account’s security questions or mobile phone number for verification.
Use only your mobile phone number for verification.

While you are in Account Info you can check if any other applications have been linked to your Yahoo account. Delete any that you didn't activate.

How do I manage external application and website connections? - https://help.yahoo.com/kb/index?page=con...=PROD_ACCT

What to check when securing an account that has recently been compromised - https://help.yahoo.com/kb/mail/SLN3516.h...sions=true

Here's a link on restoring your emails, contacts, and other settings - https://help.yahoo.com/kb/mail/SLN2160.h...sions=true