Personally, I don't think they exist and certainly not in the classical way of each roll of the dice means six new universes.
The consequences of quantum mechanics are not supposed to be superimposed unto the macroscopic world, they describe the tiniest scales only.
This is what Schrodinger meant when he came up with his cat in a box thought experiment, he meant to show that to apply these things to the macroscopic leads to very silly things indeed.
Unfortunately decades of less imaginitive and literal-minded people have took it to be, well, literal, and they keep insisting that what Schrodinger meant is that the cat is both alive and dead at the same time. It is not, what Schrodinger meant to illustrate was that micro scale chaotic quantum events cancel each other out on the macroscopic scale, giving the appearance of a smooth and singular reality.
Similarly one can expect many of these possible microscopic changes of reality to cancel each other out, leaving only one dominant apparent meta reality, which is the median of all that is possible.