exaggerated reaction

There are few well-tested treatments for this exaggerated reaction.

At that time jails were much neglected, and the period of exaggerated reaction consequent on all public wrongdoing—and which is always its heaviest and longest punishment—was still far off.

He left Russia amid heavy criticism for his apparently exaggerated reaction to being fouled.

He adds that the plants' relatedness, coupled with their exaggerated reaction to these butterflies, suggests a heated evolutionary “arms race” took place between the plants and insects.

Some of what you describe sounds typical of someone with BPD, who will have an exaggerated reaction to perceived abandonments.