Okay, you know what? It was very appropriate to apologize for the arm-yanking. I understand your motivations (not in front of the kids..) but it was way out of line, and you know it, and you apologized for it.
I would definitely talk to a lawyer, just to touch base. I find myself a bit concerned about the TOTAL level of volatility in your home right now, between your admittedly-fraught, zero-to-livid-in-.2-seconds state and your wife's road rage, etc. You can both be good, well-meaning people and things can still get out of hand in a way neither of you ever wanted or dreamed of. Try to be objective about where both of you are and not be blinded by stubborness or pride.
I don't really have any advice I feel competent to give on this one. Lotus' suggestion for dialoguing via notebook w/o face-to-face contact sounds like it might be a good plan, at this point....
We've got your back, Thinker, at least metaphorically.
"Show me a completely smooth operation and I'll show you someone who's covering mistakes. Real boats rock." -- Frank Herbert