I have had an NDE so I don't have a fear of not existing or thinking that's the 'end'', I know better.
But I do fear the process, that includes any possible pain/suffering or fall out from it that reflects on my loved ones. I lost my grandma to breast cancer (which made it to her brain), lost my mom to drugs and illness, I got to watch them shrivel up, not look like themselves, lose body parts, lose their sanity, lose their will to inhabit the body, that fukking sucks, that's traumatic, I'm not over that.