I find that arguments with my husband are a trigger for me as well. (Possibly it's just a sufferers experience that arguments can get out of control that makes them so triggering, not the act itself?) We are from very different backgrounds so arguments are pretty common between us while we learn to change our views for the other. I find that as soon as I am triggered, if I try to acknowledge the situation instead of pushing it away it seems to help.
For example, one night we were arguing about something, I can't even remember what, and he slammed his fist on the counter to make a point about noise or something, and I started to dissociate. He never even realized that he had triggered me, but when I felt myself slipping and the rocking back and forth started, I had to force myself to acknowledge that he had triggered something. I made myself mentally say "Yes. This is a real argument, but he isn't her. This is my husband not Devil Lady." Then I made myself look at him and not the floor, focused in on his eyes to prove to myself who he really was, and to know he meant me no harm.
By forcing myself to acknowledge a trigger, to accept the past in that moment, and to realize that I am not in that place anymore but am now in a safe environment, I was able to pull myself back into reality and gain the ability to say to him "Penguins. We've got Penguins" and he knew to change the subject. ("Penguins" is my safe word for him, a word to let him know I've been triggered and to change the topic.)