It's going to take some time. I've been there as have plenty of people who came to me for support when it happened to them.
While right now you're thinking of it in terms of loss, you can also celebrate the lightness that comes from not having the data anymore.
There's more..
What was the funniest thing you remember that was in there?
Now consider that you remember it. You don't need to check, you remember the things that made that memory funny.
So, take a deep breath, add it to the list of stupid things you've done to date that didn't kill you and then go and drink a glass of water and go for a walk.
This too will pass.