This question is meant for people with bpd who also have a mood disorder:

How are your BPD symptoms affected when depressed?

What does your bpd feel like when euthymic (normal) vs depressed?
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I was a diagnosed with bipolar disorder on top of my bpd a little bit ago (a comordbity). I tend to have a 2 medium or 1 big depressive episode every year at a random time.

Sometimes I feel it's hard to differentiate between my depression and bpd on a day to day basis as both can make me feel unbearably empty.  I track my mood in chunks to get a better idea since my mood changes hourly almost in any state. 

I was briefly euthymic for about 3 months half a year ago. It was a lot better, but as expected, I still experienced big mood swings, impulsivity, fear of abandonment, lack of identity, etc. When I'd have sad mood swings, I'd wonder if I was having an episode again. I would find it hard to imagine that I'd ever feel good again, but I'd perk up in a few hours.

I don't know if there was a point in typing this out. It doesn't particularly explain anything but yeah. Really curious about others.