I don't flip flop on a daily basis but I do have random thoughts of fear, guilt or hope that pop into my mind daily. Most of the time nowadays those thoughts pass quickly, although they can be intense.
My guess is that doubt is always present for everyone, it's just to what degree.
Death isn't something people truly desire, it's an escape. This causes people to procrastinate and put it off for another day, truth is that day most often never comes and they're left to pick of the pieces or slowly waste away.