I don't know how I Explain my feelings. I Just lost all of my savings money. I was holding since January, I have been Holding to make again a good amount of Money. But at the end, my holding's output is, I lost everything because of my ETH wallet got hack! Almost 5K USD Stolen. All of my hard working money. I Don't know how can hacker hacked my wallet. Because I Kept very secure my private key, My friends are telling that hacker hacked my wallet by my email address. But how can someone hack only by an email address?
I Got a security alert from Google that someone has your password after then I changed my password immediately. Then after some time, I was checking my wallet to check new Coin. And then I Shocked! I Just want to give up, can't think what should I do

I am puzzled with the statements above. You were saying that your MEW was hacked. And then you were talking about hacking using email. MEW and email has no connection at all. MEW does not need your email so how? It is confusing.
Another thing, a Google alert? Then you changed your password? I believe you are not using MEW at all. I am using MEW and I haven't used my email in making a wallet.
This should be a lesson for you. Quit whining and stand up. There's nothing you can do now. Learn how to fully secure your assets. You cannot be too sure with regards to cryptocurrency.