Hi, Hope/peace & I'd like to join Surnia in welcoming you to this site... .
You really are not alone, Hope/peace; there are many of us with children with BPD. In fact, my own adult (36) son was only diagnosed with BPD in April 2013, and finding this site shortly after is what has saved my family. So, please know that you are in the right place
I, also, would like to know how old your son is... .You say he has other issues? I ask this because my son has been diagnosed with ADD, Depression, Anxiety, Suicidal Ideation, and Substance Abuse. It's been a very long time of troubles for him, and it wasn't until just this past March and April, when he checked in to a 21-day Intensive Inpatient Dual Diagnosis Program (where he was finally diagnosed with BPD and treated for it), where there was finally light at the end of the tunnel.
If your son has multiple mental health issues, he might be able to find a Dual Diagnosis Program... .this was the first thing that has helped my son turn his life around--it was there that he finally realized what his problems were, found out what the best treatments were, and he decided he wanted to get better. If you are interested in reading my son's story, you can check out
My Son's Dual DX Pgm & NFT Story. You might find some solace to know how he got help, and to know that he is doing
really well now

Please continue to tell us more of your situation, and ask more of your questions; we have many people here who can give you support, information and insights, comfort and advice. You are not alone, Hope/peace! We are here for you... .Don't give up