If you feel this diagnosis was much better planed and considered by the doctor then accept it ( not accepting the diagnosis is common for someone with bpd) and forget about the old diagnosis. Bpd is much better as it can be cured and often gets better with time and doesn’t need strong life altering meds. Those who brought up DBT are right it is the gold standard. There are many people who will try to talk you out of bad because they have a bias against itt. They will urge you to fight the diagnosis and take meds. Don’t. Trust the pdoc who specializes in diagnosis not us who are not doctors