Many sad days come with a lack of energy so that, even when I want to do something, it's extremely difficult to find motivation, even for the most basic tasks. On the other hand, there are days when I am surprised by my own efficacy, I am active, alert, quite efficient and focused on getting a lot of stuff done. I observed these overlap with some of my most irritable moods thus they go hand in hand with plenty of anger bursts. Is that a BPD thing?