My grandfather died last week. When of his death that I didn't feel anything, just numb, until I saw his corpse at the funeral. I had just seen him a few months ago and he was perfectly fine but he just suddenly collapsed and died. My parents didn't want to do an autopsy on him so we don't even why he died but it has left me afraid that I could also just collapse just like that at any moment.

Do you have any ideas on how to mentally deal with the fear of the inevitability of death?