It is normal to feel stressed when we face difficult events. When your nervous system is working well it will adjust and modulate to a point of rest when we remove ourselves from the stressor or when the event is over. When the resiliency of our nervous system is compromised however the activation stays hyper-aroused. At this time even small stressors are felt more severely.
A regulated nervous system in contrast, allows you to react flexibly to stress and changes in your life. You are in control of how you want to respond.