i have diagnosed BPD, along with complex PTSD, major depressive disorder, anxiety and an eating disorder. i'm also a recovering alcoholic.
my BPD diagnosis was kept from me - i think it was made when i was hospitalised after a breakdown. i found out by accident at the GP surgery!
just to advise - the 'borderline' bit doesn't mean a person is on the borderline of having a personality disorder. BPD is a 'full-fledged' personality disorder, with people walking the borderline between neurosis and psychosis. it's distressing and my life can be pretty chaotic at times. i managed to kick the booze but i still struggle with food and self-harm.
on the other hand, the diagnosis when i finally got it was SUCH a relief. i had a horrendous childhood, and i learned a lot of maladaptive behaviours to cope.
i do go to a weekly support group run by MIND - i am heavily medicated and i can't work (i get ESA and PIP), but i was discharged from secondary services as BPD is still classed as untreatable by some trusts. in fact, DBT can be helpful but there is nothing available where i am.
i held my life together until my late 30s - the collapse was fast and spectacular when it came. i've had a couple of hospitalisations for suicide attempts and i had to change meds earlier this year as i was becoming very unwell again.
if you feel it might help, OP, ask for a referral to the CMHT for assessment. just...make sure you are supported as much as possible as it might be a tough time.