RSD - How Does the ADHD Brain Act Under Stress?

RSD causes extreme emotional pain that plagues both children and adults even when no actual rejection has taken place. People with RSD struggle with letting go of past hurts or rejections because they experience heightened emotional sensitivity. How does the ADHD brain act under stress? I'd like to just throw out a thank you to Dr. Marcy Caldwell who inspired the stages of emotional intensity that I'm presenting here.