well, from my own personal experience, BPD and depression DEFINITELY do NOT always go hand in hand. a person CAN have both, but they are not related. My father is a BP, and i will tell you, it makes life hell. i was severely abused physically, psychologically and emotionally, and God only knows if i was abused sexually too. but he has learned about his disorder and is doing his very best to fix things. today he is an absolutely wonderful person. he has a great sense of humor and is amazingly intelligent. he has come so far in his progress. it is simply the problems and chaos that his disorder create that really affect everyone. he and my mother got divorced 2 years ago. i wish there were some way that i could give you some information about how to diagnose yourself, but i wouldn't want to tell you the wrong thing. here are some factors that might help you decide if you are BP. just think of what the answer is, and ask yourself if you are being honest.
Is the thing you fear most abandonment?
Do you feel like the only way to keep your loved ones from leaving you is to control them?
Do you try to mentally overpower them?
Do any of your loved ones tell you that they are even afraid of you sometimes? or that they fear to leave?
Do you and your loved ones have heated arguements on a daily basis?
Again, these are not professional opinions, and they don't necessarily apply to all that are BP. they are just some characteristics my father had during my childhood that i can immediately catagorize as BP.
ALL THE BEST!!!