Worry and anxiety is a physical response to something that might harm you, it is your body’s way of keeping you safe. You might respond in different ways. You could go into what is known as “fight” mode when stressed, or might become angry and agitated. Or use the “flight” mode and become withdrawn and depressed. Finally, there is “freeze” and you are incapable of doing anything when stressed. Depending on how you respond to stress, it may keep you awake at night with thoughts running out of control in your head.