I'm new to having bpd, I haven't been professionally diagnosed but a lot of my symptoms do line up and I've been aware of it for a while, but to cut to the chase, lately I've had very sudden declines in mood where I feel numb, empty or lost and just emotionally disconnected from myself or other people or just in general.  I was wondering if this is a cause of BPD or if it's something else, thank you in advance