I'm sorry for your loss buddy and hope you can recover from it!
The other day I had a regular Chrome browser open and I wanted to go to Poloniex. When I got to the site I noticed a new tab popped open that redirected to a bunch of sites, one of them being http://piz7ohhujogi.com and then landed in a clone of Poloniex login page. The only difference was the url was something like log-in-....com and not Poloniex!!

I put in fake details and it was immediately "refreshed" to the real Poloniex login page.

My thoughts are, it was a malware doing phishing to my account. and the idea is once i've put in my 2FA they would immediately use it as they already know my user / pass and.. viola! the account is hacked..

I tried Bittrex as well and the same thing happened.. So this was NOT a poloniex issue but a problem with my Chrome browser.

This did not happen in FireFox or chrome incognito. I cleaned my computer and think I solved the problem but I'm VERY cautious now before I log in to any exchange.. ALWAYS check the URL before signing in!