Hi Nova 88: Sorry about your situation. I can understand that you are scared and conflicted.
I’m in therapy for my own anxiety but usually in my sessions we talk about strategies for communicating with him and dealing with the stress I’m feeling from our relationship.
I know that your therapist can't diagnose your husband, without him being involved, but have you shared all these details with your therapist and asked for an opinion regarding a diagnosis for your husband?
It's understandable how some behaviors from his parents could be tied to some of his current behaviors. It's, also, possible that his father's rages were due to a mental health condition, that your husband inherited genetically.
The worst evening in the last few months he raged so hard that he threatened me and physically would not let me leave. He went into detail about horrible things that he COULD do to me and kept repeating himself. Then he would follow up with things like “I would never hurt you, why would you believe that?” And then go right back into the aggressive intimidation. In the middle of the episode, he would have moments of clarity where he would legitimately ask me what had just happened. Like he had amnesia and could not remember the last hour. Then he would go back into rage. I almost called the police.
The above behaviors are alarming and need to be taken seriously. For your own welfare, you need to make a safety plan for yourself. You have to believe that the horrible things he says he COULD do to you are possible.
I don't think that the above episode you describe is typical of BPD, and perhaps some other mental health issues need to be ruled out. I have to admit, I'd be scared. You mention alcohol abuse and other self medicating. Could he have abused some type of drug, during that very scary event?
Stressful life events, can bring on extreme BPD behaviors. So, many of the behaviors after the death of his friend and the loss of a job, kind of fall in line with that. The scary event seems a bit extreme, and could have a different cause.
Since he says he won't ever take any meds and won't go to therapy, that leaves you in a miserable situation. He isn't making sense, if he won't try meds for his psychiatric issues, but he will choose to use alcohol. Spacing out alcohol during a day, doesn't make it less of an addiction and it is a means of self-medicating.
I'm hoping you don't have children, or that it's a possibility in the near term. He may work with children, and hopefully there won't be any abuse issues there. Most problem behaviors tend to happen at home, where a person feels comfortable. You would have to anticipate that he would inflict similar verbal abuse upon his children and mimic the behaviors of his parents.
You might talk to your therapist about a safety plan for you and think through some situations. Have an extra car key hidden somewhere, think through what you would do with situation A, B & C. Think over the things he said he could do to you and how you might prevent or deflect those situations.
Think about what room you could escape to, if you had to wait for police to come. (i.e. a door wedge, used to keep doors open can be used from the inside to keep someone from coming in). Maybe have some personal protection things, like pepper spray and a stun gunn, etc. There can be a pro & con, as they could be used against you.
Anyway, just prompting some thought. The part of him that couldn't remember what he said, whose eyes looked strange, you need to prepare to defend and protect yourself against that persona. It might not come back tomorrow, next week or next month, but the next time some stressful life event happens, you have to anticipate that the extreme and alarming behaviors will return and you need to be prepared, should you choose to stay.
I'm sorry this is happening to you. I hear that he has some special traits that you adore. It's a common situation and the stories here are similar: He/She is the best thing that ever happened to me, except when they are verbally and/or physically abusive, controlling, degrading, demeaning . . .and the list goes on.