If the many worlds of the Many Worlds Interpretation of quantum mechanics are real, there's at least a good chance that Quantum Immortality is real as well: All conscious beings should expect to experience the next moment in at least one Everett branch even if they stop existing in all other branches, and the moment after that in at least one other branch, and so on forever.
However, the transition from life to death isn't usually a binary change. For most people it happens slowly as your brain and the rest of your body deteriorates, often painfully.
Doesn't it follow that each of us should expect to keep living in this state of constant degradation and suffering for a very, very long time, perhaps forever?
I don't know much about quantum mechanics, so I don't have anything to contribute to this discussion. I'm just terrified, and I'd like, not to be reassured by well-meaning lies, but to know the truth. How likely is it that Quantum Torment is real?
What makes you privilege the experience of dying over other, more positive experiences? That is, even if there's a very large number of branches where we experience this suffering, wouldn't there also be very large numbers of a branches containing positive experiences? It's the ratio of positive to negative experiences that matter, not the raw quantity of one or the other.
ETA: That is to say, the reasoning "when I'm close to dead, no matter how likely I am to die in the next instant, at least one branch of me continues on suffering" is symmetric to "man this hot shower is amazing, good thing there at least one branch of me that continues to enjoy it indefinitely."
Because the subjective observability constraint doesn't cut off cases where the shower ends badly.
Not saying I entirely buy QI - measure clearly means something - but that's how the argument goes.