Hi and welcome!
It certainly sounds like you both have some challenges to deal with. Dealing with our own triggers while being with someone who is triggered at the same time is so difficult. Are both of you in treatment? DBT?
Can you tell us in more detail what happens when you both are dysregulating?
We do have a pdf that is DBT skills called
Distress Tolerance Skills that you might find useful along with a discussion on the topic here:
https://bpdfamily.com/message_board/index.php?topic=331665.0See what you think and then we can talk a bit more.
Again,
