Having a sensitive nervous system is normal, a basically neutral trait. You probably inherited it. It occurs in about 15-20 percent of the population. It means you are aware of subtleties in your surroundings, a great advantage in many situations. It also means you are more easily overwhelmed when you have been out in a highly stimulating environment for too long, bombarded by sights and sounds until you are exhausted in a nervous-system sort of way.
