The only thing in your post that suggests you have bpd is you stating the dr. dx you with it.

You wanting to end it all could be attributed to Depression, as well as, many other things. You went to the hospital voluntarily <-- not very bpd'ish.

You get to the hospital you panic, you're anxious .. fight or flight kicks in, you take off.. Could be related to depresion, anxiety, traits of something else.

So.. the dr. dx you with bpd.... but your post isn't screaming bpd..