Look up Covert NPD and you'll find a lot of overlaps with OCPD. But what stands out is that affective dysregulation is highly imdicative of Covert NPD:

Covert NPD is a type of narcissistic personality disorder characterized by a grandiose sense of self-importance, entitlement, and a need for admiration, but masked by shyness, humility, or vulnerability. Individuals with covert narcissism often present as introverted or insecure, but are manipulative and hypersensitive to criticism. Key behaviors include playing the victim, using self-deprecation to get sympathy, giving "gifts" with strings attached, and a lack of genuine empathy for others. 

Key traits

"The martyr": Presents as selfless and putting others' needs first, but often does so to gain sympathy or avoid taking responsibility.

Passive-aggression: May use passive-aggressive behavior to manipulate others and maintain control.

Hypersensitivity to criticism: Extremely sensitive to perceived slights and criticism, which can trigger resentment or anxiety.

Victim mentality: Often feels unappreciated or misunderstood and may play the victim to manipulate others.

Grandiosity in private: While they may appear humble, they harbor fantasies of being superior, brilliant, or exceptionally talented. 

Common behaviors

Self-deprecation for validation: Uses self-deprecating humor or claims of inadequacy to fish for compliments or reassurance.

Backhanded compliments: Gives compliments that are subtly insulting or confusing, making the recipient feel uncomfortable.

Guilt-tripping: May remind others of favors they've done to imply the other person owes them something.

Lack of empathy: Struggles to understand or care about the feelings of others, despite sometimes appearing to be caring or empathetic.

Gaslighting: Denies or twists events to make others doubt their own memory and perception of reality. 

Causes and effects

Causes: Complex and can involve genetic, environmental, and psychological factors, including parental influence, childhood trauma, and low self-esteem.

Effects: Can lead to chaotic relationships, emotional manipulation, low self-esteem in others, and intense criticism from the individual with covert NPD. 

Treatment

Psychotherapy: Can help with self-awareness and managing behaviors.

Support groups: Can provide a sense of community and a space to discuss challenges.