I don't know about you, but often when someone gets angry with me in real life, I don't really know how to react, so things tend to go badly. But then immediately afterwards I start thinking about what I could have said to make the situation turn out completely differently. Usually I come up with quite brilliant solutions -- which, of course, do me no good whatsoever.
But now you, with great luck, are in exactly the opposite situation. You have had this very vivid dream, and if your subconscious is at all good at its job, it was probably quite accurate. Probably accurate enough for you to be able to imagine *exactly* how you would feel after such an argument. Great! It's as if this actually happened. Dwell for a moment on that sinking feeling -- long enough for the Monday-morning quarterbacking to kick in.
Once you've come up with a better way to handle it, file that away and remind yourself that the fight hasn't actually happened. But if it does, you're all set -- you know exactly how to react. Well done.
Good luck!