That's interesting, and also clarifies why it's hard to make a distinction. I would say hyper-arousal in PTSD would be enough to "deregulate" emotions into their extreme, good or bad, which also goes back to the stress cup explanation floating around here. Perhaps mental health professionals are more likely to diagnose BPD rather than PTSD when the cause for the deregulation isn't immediately apparent or trauma history is ruled out?
Well, for me, BPD causes all emotions to be deregulated all of the time where PTSD stress cup (which is 100% correct) is only when the person is under a bit of stress. Theres more up and down motion for PTSD for me. There are times where I feel like I am on a more normal plain. Mostly when isolated as some of the most normal things in the world cause the hyper arrousal (which would give you one reason for PTSD isolation) but for BPD it is all emotions everytime I have them. It is a constant up extreme, down extreme. That was helped by the Seriquel but before that it was a never ending extreme roller coaster ride.
But, comorbidity causes a mesh together mess of symptoms. At one point I was a extreme emotion mess going off when someone asked me if it was raining outside. It was pretty bad which is why I was forced into therapy but for the longest time I had no even plain for emotions. It wasn't until I worked hard on both was I able to distinquish between them and even now it can be impossible to. But there are hallmark signs of BPD and then there were hallmark signs of PTSD when I first came into therapy. The BPD dignosis happened first as it was blaring obvious. But it still has a dignostic criteria that should be used to prevent misdignosis and then we went back to it once he made the PTSD dignosis to ensure it still fit and for what's in the DSM today, it does. But that's how you would prevent a misdignosis. My therapist also brings out the DSM and we go over the dignosis criteria and he ensures that we agree on what fits and what doesn't. So I am always part of my dignosis. Which helps prevent a misdignosis as well. I would encourage to ask a therapist to do that with you as I wouldn't accept the PTSD dignosis and it wasn't until we did that did I see that yes, it did actually fit me.
That's where BPD as a cluster of symptoms gets somewhat hazy to me. It's hard for me to understand how manipulation (for example) could be seen as a stand alone symptom and not as an expression of a symptom. E.g., deregulated fear may express itself in the need to manipulate and control one's environment. In that sense, I can see how PTSD could also display itself as somewhat manipulative, i.e. having to manipulate one's environment to control or prevent triggering situations. Perhaps the distinction would be that BPD manipulation is said to occur for the sake of manipulation itself, in other words, perhaps there is a narcissistic, psychopathic (in clinical terms) element in BPD that is not attributed to PTSD?
Manipulation of people. Like once I self harmed, took pictures of it, sent it to someone and said "look what you made me do". Stuff like that. Many BPDers talk about writing letters to people in their own blood. Someone in the service dog community that is a creator on youtube made a fake suicide attempt and posted a picture (was said to have been a friend) of what turned out to be an old picture of her in a coma in the hospital with a breathing tube (said person has a TBI and has seizures) on instagram (they have thousands of followers mind you) and then a friend ratted her out saying she was at work the very next day. I was rather affected by it and I spoke about it in therapy and my therapist said "what a BPD thing to do". So manipulation of people is what BPD is whether that's a cry for help, or a disprate attempt to avoid abandonment (which is the case for me) or what.
(though I'm assuming BPD comes with emotional flashbacks as well? or non-relational triggers?
Nope, not for me anyway. All flashbacks in every form is a PTSD thing for me.
Which goes back to, "it's impossible to tell the difference"
No, not impossible. Hard to tell when the person has both PTSD & BPD as they do mesh together but there are many things I can plainly say today "that's a PTSD thing" or "that's a BPD thing" which is how I know what to and not to post on here today. When i first joined I was posting a lot of BPD stuff as I really had no idea which things went with what disorder but today they are a lot clearer. Not fully clear and they do still mesh but a lot clearer.
The differences I see are
Relationships
BPD - unstable and intense interpersonal relationships .. extremes of idealization and devaluation;
CPTSD - persistent difficulties in sustaining relationships and in feeling close to others.
Self view
BPD - persistently unstable self-image or sense of self;
CPTSD - persistent beliefs about oneself as diminished, defeated or worthless, accompanied by deep and pervasive feelings of shame, guilt or failure
Origin of emotional volatility
BPD - affective instability due to a marked reactivity of mood
CPTSD - severe and pervasive problems in affect regulation
This is very helpful and I still see myself under CPTSD more. But the DSM doesn't have CPTSD yet thus no other dignosis can be made. The relationships, idealization & devaluation is the one symptom of BPD I don't have but I do have a difficulity in keeping relationships. And really same goes with all of them. I just fit so much more under CPTSD.
If the question was the differences of CPTSD and BPD then I couldn't help there. But PTSD and BPD do have many differences. And it seems even CPTSD & BPD in the ICD have some good differences.