Why did you keep all your life savings in BTC? I really don't get it. Unfortunately the only thing that you can do now is analyse your actions step by step to find out which software has been compromised. You either have a trojan on your computer or downloaded fake wallets that had a backdoor allowing the hacker to get your keys.
The money is gone either way, calm down, have some alcohol or try to get some sleep. The sooner you get over it the better for your health.