The question of nothingness!

This blog exists for you because you can see it. Because you can make an attempt to comprehend it. But what if it wouldn't have existed? What if the screen you're staring into right now wouldn't have existed too? What if YOU wouldn't have existed? What if no life would have ever existed anywhere in the whole universe? Or for that matter, what if even this universe wouldn't have ever existed? Exactly WHAT would have existed then? And where would have that "nothing" existed (given that there would've been no universe in the first place)? How big or small would have this "nothing" been? And lastly, is THIS the limit of human imagination?