Well sorry to hear that pal, but sad to say there's no big chance for you to recover it. Perhaps you probably clicked some phishing site on MEW, because those Phishing site are good in copying the original interface, and maybe that phishing site appeared to your monitor when you open MEW to your laptop or desktop. Once you click it that the hacker can able to steal your coins in Mew, due to they have your private already.
I think take it as a charge experience and lesson learn mate and you better be careful next time.