hi tp2712. i'm really sorry for what you're going through. you have been articulate about what you're feeling and it's not always easy to open up about this sort of thing so you should credit yourself for reaching out here.
i have tried ignoring it
i have clinical depression. i knew in my 20s that something wasn't right, but for years i tried to think my way through it, or live my way through it. but i never did, until i had a complete breakdown. only then did i go to the psychiatrist and i got the help i might have gotten much earlier. you say that you've made appointments with mental health professionals. if you call again i doubt they'd put you off. if you explain your situation they'd surely understand and give you another appt.
just so you know, this is a site for those who have been in relationships with people who have BPD. some of what you read here might be triggering. we do have a page of resources,
Resources for BPD Sufferers, that has more links.
do you think you could call mental health services again?