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?
Doesn't this mean that you should deliberately avoid finding out whether cryonics can actually preserve your information in a retrievable way, because if it can't it would eliminate the vast majority of the worlds that would have brought you back? Whereas if you don't know it remains undetermined. Am I getting this right?
You're confusing subjective probability and objective quantum measure. If you flip a quantum coin, half your measure goes to worlds where it comes up heads and half goes to where it comes up tails. This is an objective fact, and we know it solidly. If you don't know whether cryonics works, you're probably still already localized by your memories and sensory information to either worlds where it works or worlds where it doesn't; all or nothing, even if you're ignorant of which.