I definitely get this. It used to be really bad, to the point that it was so draining and sometimes painful it made it hard to function. The only thing that's really helped with it is meds, because fighting it myself I just end up in a constant battle with my emotions and make it worse. Lamictal seemed to help this for me, I think, and now that I'm tapering that it's been getting worse again. Other than that I just try to mentally detach myself sometimes in situations where it's getting to me.
I feel like mindfulness could probably help with this in some way, but I've only started practicing that really recently so I can't give any personal experience.