I think it was actually someone on PC who once said that, according to research, BP is a disorder of moods, and BPD is a disorder of emotions (aka emotional dysregulation). I'm not saying you meet the criteria for BPD (there are lots of traits, the most salient being fear of abandonment).

I don't think emotional dysregulation is a part of Bipolar Disorder, except in the sense that when we are stable, or at baseline, we are who we are, with all of the additional challenges we may face. One of those can be emotional dysregulation (I think in response to environmental stimuli), which I think is different from mood/BP episodes, which often come out of nowhere, or perhaps as a reaction to stress, etc. Additionally, I think emotional dysregulation can last for a relatively short period of time, whereas Bipolar mood episodes last, usually, for a week or more.

The self care talked about here is key and I've read some wonderful options!

At least at baseline, I don't suffer from this, but I do suffer from a great deal of anxiety. Self care (breathing and other exercises recommended by my therapist) has helped a lot. Also, for example when driving, I tend to catastrophize and be convinced that I'm going to get in an accident; reminding myself again and again that this is not the case, helps. Focusing on what I can control has helped, as have other suggestions from my therapist. Talking about it with her has also been helpful. When I'm hypomanic, all anxiety disappears; oh what heaven that is!!! Until it takes a nasty turn to mania.

I wish you the best of luck. With the self care you have mentioned, and endorsed, it sounds like you're on the road to conquering this, or at least ameliorating it!