Hey there @C1997 ,
Welcome to the forums!
I also have a diagnosis of CPTSD/BPD. However, I can't say I've tried herbals or natural options.
You may find that research into BPD shows there is no conclusive evidence that medication works for BPD. Whilst medication may support the anxiety, depression etc that may be associated with CPTSD/BPD, there is no clear evidence that it does much for the BPD. Rather, psychotherapy (talking therapy) has been shown to make the most difference.
Psychotherapy for CPTSD/BPD can include:
ACT
DBT
MBT
Schema Therapy
Narrative Therapy
This website may be helpful: https://www.spectrumbpd.com.au/information-resources
From my own lived experience, I am pleased to say I've come out the 'other' side of BPD/CPTSD. I've learnt a lot, and it's been a real journey of discovery.
I'm not saying recovery is 'easy', but it is certainly possible.
I look forward to hearing from you.