The hacker already has your private keys. Create a new wallet and a new address. Send all your funds away as quickly as you can. Don't bother securing your old account, it's gone.
He is lucky because I don't know what is my private key yet! I've opened a new wallet and hope it doesn't happen again
1. Do you ever use online vanity addy service ?
2. Do you have good security on your pc ?
3. Do you use internet cafe or private pc ?
My guess is you download something but you dont realize that was danger for you.
Scan your pc with good antivirus , then make new wallet again with new email.