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I'm sorry to hear of the situation. Your description is complex and you describe a range of symptoms that don't all necessarily fit into one discreet diagnostic category. This is actually quite a common situation and so we usually try to determine if there is a primary (main) diagnosis. Keeping in mind that it is impossible to diagnose someone via JustAnswer, my initial reaction would be that you may be describing (as a primary problem) Borderline Personality Disorder. The cutting, mood instability (of quicker frequency than usually seen with Bipolar), suicidal ideation, irritability and eating problems are hallmarks of the disorder and it is frequently miss-diagnosed as Bipolar Disorder or recurrent Depressive Disorder.
I'll post a brief description of the disorder below and wait for your response to it before proceeding further.
The main feature of borderline personality disorder (BPD) is a pervasive pattern of instability in interpersonal relationships, self-image and emotions. People with borderline personality disorder are also usually very impulsive. This disorder occurs in most by early adulthood. The unstable pattern of interacting with others has persisted for years and is usually closely related to the person's self-image and early social interactions. The pattern is present in a variety of settings (e.g., not just at work or home) and often is accompanied by a similar lability (fluctuating back and forth, sometimes in a quick manner) in a person's emotions and feelings. Relationships and the person's emotion may often be characterized as being shallow.
A person with this disorder will also often exhibit impulsive behaviors and have a majority of the following symptoms:
● Frantic efforts to avoid real or imagined abandonment
● A pattern of unstable and intense interpersonal relationships characterized by alternating between extremes of idealization and devaluation
● Identity disturbance, such as a significant and persistent unstable self-image or sense of self
● Impulsivity in at least two areas that are potentially self-damaging (e.g., spending, sex, substance abuse, reckless driving, binge eating)
● Recurrent suicidal behavior, gestures, or threats, or self-mutilating behavior
● Emotional instability due to significant reactivity of mood (e.g., intense episodic dysphoria, irritability, or anxiety usually lasting a few hours and only rarely more than a few days)
● Chronic feelings of emptiness
● Inappropriate, intense anger or difficulty controlling anger (e.g., frequent displays of temper, constant anger, recurrent physical fights)
● Transient, stress-related paranoid thoughts or severe dissociative symptoms
I will be away from my computer for a while but I will respond further as soon as I return.