I'm know there's companies that specialize in keeping you off the grid while it all goes down.
Change your phone numbers, close your social media accounts, get new email addresses..and be very choosey who you give the new info to. Stay out of the media. Disappear.
Lets just put it this way. I have the exact same name as someone who won a lot of money not that long ago, not that far from me. I woke up the next morning to a bunch of new friend requests on FB from people I had no idea who they were as well as lots of unsolicited messages from FB strangers, a few emails, and lots of "wow congratulations" type messages. Coworkers looked at me funny when I showed up for work. Then I posted publicly on FB that it wasn't me, changed my FB photo to an actual photo of myself (so those with a half brain could figure out I didn't match the media photos of the *actual* winner) and things slowly died off, but it was a good taste of what inevitably happens.
But, if I ever won it, I'd be employing the skills of one of those "make me disappear" companies in a hurry. As much as I love my neighborhood and such, I'd be gonzo, off the public radar immediately, probably down to some secluded little island in the caribbean for a year or so to start, and fly my friends and family in and out every weekend if they so desired.
And I always wanted a yacht. Yes, there shall be a yacht.