He took with Him Peter, James, and John, and began to be deeply troubled and distressed. Then He said to them, “My soul is consumed with sorrow to the point of death. Stay here and keep watch.”
Your heart can be pounding in a supermarket queue, and on top of the fear comes a second voice: a real Christian wouldn't feel like this. Then you are anxious and also ashamed of being anxious, and the two together can feel heavier than either one alone.