Fear impacts our thinking and decision-making in negative ways, leaving us open to intense emotions and impulsive reactions. It is one of the biggest reasons for fatigue and depression. It influence the brains chemistry, which in turn produce less Serotonin, dopamine and nor-epinephine. These chemicals influence part of the brain that regulate fear, memory and emotions. Low levels makes it highly sensitive and unpredictable. Doctors will give medicine which will help but there is a better way.