I'm looking for a word or expression describing extreme fear of sudden death. This could be caused by a (real or perceived) life-threatening situation, such as acute illness, violent assault or disaster/accident.
Terms to describe the fear of death at some point in the future can be included, where they lead the individual to experience panic states.
The form I'm looking for is something like this:
As the armed robber ran off, Sally's X began to wane.
The doctors had exhausted all alternatives and could provide nothing more than painkillers and a priest attempting to soothe the patient's X using calm words.