A person who is under stress may find that she has more and more physical symptoms. She may get headaches, chest pains, feelings of tiredness and tension. She may fear that she is physically ill, that she is going to drop dead of a heart attack. But in fact she is just doing too much. She needs to slow down, relax, take some of the worry from her life.
Some people experience real fear in the most unlikely places.
Sometimes even when just sitting at home he may find that his heart is pounding, he is sweating, unable to get his breathe and terrified that something dreadful is going to happen. Other times something dreadful has happened. For example, the person may have seen violent death first hand. She may be unable to get the image of it out of her head. She may awake petrified from nightmares.