Ive read parts of this before and really found it interesting. It also really cleared up for me why my psych had said that my affective instability could be caused by either or both bpd/bipolar. I knew little of cyclothymics and assumed that any quick acting mood change with anger involved (wake up,see the sun, love life, but step on a kids toy on my way out of bed and suddenly hate the world, feel like a failure and want to break things) was BPD.. however now i see that the BPD type reaction could be part of a dysphoric or mixed state. There is SUCH a huge overlap.