You may want to consider cognitive behavoioural therapy if you find yourself melting down a lot. It works by making you aware of your bodies physiological stress response to things and controlling the physiological response to moderate your reaction.
Therapy of this kind is usually group based and takes place on a consistent day over several weeks in which you learn about the chemistry of the brain and body and is effective in a range of bpd and anxiety disorders
Alternatively, you can use the csd metgod which is a crisis management strategy of in a stressful situation you must first cope then seethe then dialate. This method is notable for having a 41% success rate in permanantly removing symptoms.