Taphephobia

Fear of being buried alive is the fear of being placed in a grave while still alive as a result of being incorrectly pronounced dead. The abnormal, psychopathological version of this fear is referred to as taphophobia (from Greek taphos, meaning "grave"), which is translated as "fear of graves".^[1]

I made this blog post cause as of lately I have been so scared of this I can't even watch someone on TV being buried alive. It just freaks me out. So when I die i want to be cremated.