I have been diagnosed with Borderline (sadly you have to say Borderline or people think Bipolar).
I've managed to reduce it by not interacting with 90% of places where a likely conflict would happen.
Rationalisation doesn't work for me as the rational thoughts come AFTER the explosion of emotions.
I still occasionally punch my thighs in frustration and anger.
I live a life that mostly avoids conflict now because I know I could snap at any second. This obviously limits my life, but it's better.