Have you heard, or invested in DBT? It's basically the only thing that truly works, and was made/created for BPD specifically. There's a great DBT workbook by Matthew McKay, Jeffery C. Wood. I think it would be worth a purchase.

Also, I read your other thread about that friend/girlfriend, and if it were me, I'd try to cut her out of your life.

These are just my opinions, they are not suggestions.