Hello and welcome!
I've got one tip for you based on what you said here.
I lose my cool. I get dysregulated. There seems to be no way to talk about even simple things, everyday stuff like housekeeping issues.
Losing your cool and getting upset is completely natural, and it happens to all of us, the best of us, and the worst of us.
There have been many times where I *wished* could stay calm and collected, and say something peaceful... .but knew I just couldn't at the time. You sound like you recognize when you get there too. What I've learned is that the best thing I can do at that time may just be take a time out and disengage.
As in change the subject, end the conversation, or leave the room. Or just go to the bathroom so you have 2 minutes to calm down and think. It really does help--help you, and help your relationship--if you *KNOW* that anything you say will be angry and come out wrong, just not saying it is a big step forward. And if you stay and try not to when you continue to be provoked, eventually you will burst and say something you later regret.