PROBLEM: If you got hacked and all your mails has dissapeared. Can you recover it from Google?
SOLUTION:
1) try to recover it form the bin. Bin is where Gmail puts the messages you delete. They sit there for 30 days after you delete them, before Gmail deletes them completely, so you have a whole month to spot any errors and put them right.
If the mail you have deleted by mistake is still in Trash, you can select it and Move it back to your Inbox using the Move button.
If more than 30 days have gone by, or if you chose to Empty Trash or used the Delete Forever button on any of your trashed mail, then those messages are gone forever and cannot be recovered.

2) NB See the following article about how to re-secure an account that was compromised:
http://gmailaccountrecovery.blogspot.co.uk/#security(When you reclaim Your Account)

then follow this trouble shooter for missing mail

http://support.google.com/mail/bin/answer.py?hl=en&topic=1668979&ctx=topic&answer=1195979
if needed , follow this for missing contacts https://support.google.com/mail/answer/1069522?hl=en

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