A freeze, rip, or crunch are the most popular hypothesis. Even if you have a crunch, that doesn't mean there is a bounce. Even if there is a bounce, that doesn't mean matter is going to be arranged again in the exact same way. Even if it's arranged in the exact same way, that doesn't mean that the person who represents you would truly be you in that you feel like you are having an experience right now. Someone else would be having that experience.

Long story short, there are plenty of things you could have anxiety about, but this isn't one.