I was just a victim of hacker wallet (MEW), is there any way to overcome it, or find out who this person is, or can we recover what has been stolen .. ?? 
Nope,because transactions are irreversable,you have lost a lot i presume? because if not you arent going to post this here.You should have saved yourself from getting hacked using metamask extension.Do use some hardwallet i suggest ledger nano s because it is the cheapest yet most trusted hardwallet by the community.