You could have BPD and Bi-polar at the same time. I would check with you T and pdoc. they should be able to help you understand better, but I do agree with Bakery that BPD tends to hit really hard when you are triggered or in a very stressful situation. If things are going well then you won't notice the BPD as much or any at all. It never goes away as Bakery said, you just know how to sort out your emotions and make sense of them all to not let them bring you down.