I've been diagnosed with bpd 2 years ago and have been in therapy ever since. In addition to basic dbt (dialectical behavioural therapy) which helped me change the way I deal with a lot of things, what helped me most on the inside when it comes to dealing with feelings and anxiety was zen mentality. My therapist is into it and he gave me a simplified book about zen philosophy and it has since helped me tremendously. Thought I'd share. 