Q: WHAT SHOULD I DO WITH MY HACKED GMAIL ACCOUNT?

A:

  1. Change your password to a strong password (minimum 15 characters).
  2. Do not use this password for anything else.
  3. Enable Google 2-Factor Authentication.
  4. Done.

All information that has been harvested from your account is water under the bridge. You may need to do some damage control, such as changing all of your passwords.

Original post: https://www.quora.com/What-should-I-do-with-my-hacked-Gmail-account/answer/Marc-Mintz-4