Unfortunately for your third-cousin-twice-removed's pet fish, or whatever, they're mostly right about this part. The similarity to BPD is a significant part of why C-PTSD still hasn't been accepted into the DSM. It is in the ICD, a diagnostic manual widely used outside the US, but the ICD uses a distinctive model where "Personality Disorder" is a primary diagnosis and with what are considered separate disorders in the DSM treated as subcategories. People diagnosed with BPD in a country using the ICD-11 would fall into the "Borderline pattern", which is essentially the same thing but with symptoms regarded as secondary to a broader diagnosis, meaning that C-PTSD isn't a duplicate if the clinician doesn't believe the patient fits other criteria required for PD.
Even on paper, C-PTSD looks extremely similar to comorbid BPD and PTSD. Both include a lack of coherent identity, disorganized attachment, clinically significant issues with emotional dysregulation, and often dissociative or paranoid episodes. The primary differences are that C-PTSD doesn't require a pervasive fear of abandonment (which BPD technically doesn't either, but that's like saying a cat is technically a fish; it's also where the proponents of C-PTSD as an independent diagnosis tend to draw the line), BPD in and of itself doesn't require a history of trauma, although it usually does, and C-PTSD can at least theoretically develop in adulthood due to prolonged and extreme trauma. In practice, a diagnosis of either C-PTSD or DES-NOS (which is a 'Not Otherwise Specified' category that the condition is usually diagnosed as in countries using the DSM-V) virtually always means, "This person definitely fits the criteria for BPD, but I don't personally find them annoying, angry, or female enough to actually put that in their medical charts."
For anyone who is worried that they maybe have it (
because yeah, that's definitely what this other individual is on about; it's also extremely BPD of someone to take every comment about BPD personally enough to get sad and post an obvious first-person powerlevel about it on Kiwifarms, just saying): you aren't doomed because of your diagnosis, because it's apparently the most treatable of all personality disorders.
The problem is that people who suffer from it rarely put in the effort needed to effectively treat it.
BPD, NPD, and similar disorders are ego-syntonic, which means people who suffer from them are convinced there is nothing wrong with them -- it's everyone else who is evil and crazy!
They also take absolutely everything personally and will read insults into the blandest of statements, even into things that were meant as supportive, so tend to drop out of therapy as soon as it starts to get even close to effective.
Many also accuse their therapists of life-ruining things like rape, cannibalism, Satanic ritual practices, and child abuse, which is why any therapist who works with BPDs will privately video-record every session just in case.
If you have or suspect you have either BPD or C-PTSD, the solution is extremely easy even though it will feel like the most difficult thing you will ever do: accept that you need to commit to intense specialized therapy or else you will suffer horribly for the rest of your life and possibly end up in prison. Seek a licensed clinician (not a counselor, not a life coach) who specializes in Dialectical Behavioral Therapy. Do not choose a clinician who also has BPD; they will usually tell you upfront if they do, LOL. See the cow "Poppy Diabolique" for a good example of why you don't want that.
Go to every session even if you have to copay; consider it an investment that's as important to your future as a college education and will serve you much better than stocks or crypto. Remind yourself not to read insults into everything your clinician says and not to take everything personally; no modern therapist will deliberately say something cruel with the intent to hurt you, and if anything, they tend to play softball. If you're confused about something they say, ask rather than assume. Don't lie, even about things that make you look very bad. Commit to the process like your life depends on it, even when it's deeply uncomfortable.
If you put as much effort into therapy as you put into fucking up your life and causing chaos, while also reducing the amount you fuck up your life and cause chaos, you will get better.
What you should absolutely never do is use either C-PTSD or BPD as a shield for your behavior or for internet cred. It's also a good idea to avoid "support groups" for the disorders, which can include comment sections on videos or social media posts created by "trauma therapists" and anywhere else that people throw trauma-dumping pity parties.
Although BPD especially is considered "treatment resistent", that just means anyone who *can* reduce their symptoms is a total gigachad.
Good luck.
