Gmail account hacked

Hello,
Some one hacked my google account *****@gmail.com on 2/3/2017 at around 3pm IST .
He has changed the password as well as recovery mobile number and so verification code is sent to different number ending with *********99 which is not mine. Really worried because there were mine and my family id proofs and many other important documents. Pls Need help.

https://ccm.net/forum/gmail-146/new