I'm coming to believe there is definitely a link between parental Narcissism and borderline personality disorder. NOT that I am suggesting anybody that posts on this forum has BPD ... but out of the people I know that do, they typically have a VERY narcissistic parent, especially an N mother. (Why is it I feel compelled to say "AN N" but if I write out the whole word, it's "A narcissist"? I digress) ... there is more to BPD than just rapid swings from one mode to another, but the question you are asking could be a component to the way BPD people respond to stress. People with this problem stuff their emotions until they just can't stand it anymore, and then they explode. So, you could say they swing from being a "little voice" to aggressively making sure you are heard.
I have had this pattern of expressing my emotions, although I don't qualify for BPD in any way and it is not so severe that I have ruined relationships are anything (thank goodness!). I have had to learn to assert myself even when I am in "little voice" mode because I know if I don't, I will eventually blow. up.
I have found Marsha Linehan's Dialectical Behavior Therapy (DBT) tremendously helpful. You can get workbooks on DBT skills anywhere books are sold, and so although being in a DBT program is important for somebody that actually has BPD, for those of us with milder problems you can start practicing DBT skills on your own. I actually have experience teaching DBT skills to others, and ironically (and serendipitously!!!!) it saved my life in several situations!!!
Briefly, DBT teaches that there are three mind states: emotional mind, wise mind, and reasonable mind. Imagine them as three overlapping circles in a row. Emotional mind is the left circle, reasonable mind is the right circle, and wise mind is the middle circle. When we are aggressively asserting ourselves and working off the sheer emotion and frustration of not being heard, we are in emotional mind. Rage, terror, suicidality, etc. all fall within emotional mind. When we are in "little voice" mode, we are usually in reasonable mind. We are trying to be reasonable, not "overreact" as we have always been accused of doing, keeping a lid on our gut reactions to injustice, not trusting our "gut" which is of course EMOTIONAL MIND. DBT teaches you to live MOST of your time in "wise mind" --- the middle circle. Wise mind is the place where you LISTEN TO and RESPECT your emotional reactions, your "gut feelings" but does not let those gut feelings completely take over and drive the bus. You retain your ability to be strategic about how you express your emotions; you are able to discern whether you are taking your rage out on the wrong person, or if it will do you any good to tell them off, or if you will have to pay too dearly for what you are tempted to do. BUT you still respect that your gut, your emotions, are there for a reason and should be respected at all times. Your emotions are not ignored or invalidated but rather put to good use.
I do a DBT worksheet when I get overwhelmed and it really helps ... and so far I'm not a patient or client at all!!!!