Emotional dysregulation is when a person feels an emotion so intensely that the emotion takes over and cannot be subdued. With rejection sensitive dysphoria, the person experiences extreme emotional sensitivity and pain triggered by the perception—real or imagined—of being.

https://chadd.org/adhd-weekly/rejection-can-more-painful-with-adhd/

https://chadd.org/wp-content/uploads/2016/10/ATTN_10_16_EmotionalRegulation.pdf