This stage occurs if the stressor persists. This may occur right after the event or this may be a sign that there is too much stress in your life. With prolonged stress, this stage may lead to sickness. This is caused by the weakened state of the immune system due the increased amount of stress. Your immune system is a combination of cells that work together to protect you from invading organisms or materials.
Stress is generally different for each individual.
It is a very psychological phenomenon. The way you respond to the stress may determine how it affects your stress levels. For example, your grandparents are coming to visit you at college and your room is at its messiest state. This could be a good time to clean your room. It is positive in that you got something done.