I slapped back my mother, was I still in the wrong?

Right now I'm pissed off and this just happened a couple hours ago. Just got into an heated argument with her. After exchanging words, she slapped me kinda of hard and then I turned around and slapped her back.

Part of me feels guilty but then I dunno. She started it. Yet, she was totally shocked as if not expecting it. We're not on speaking terms at this moment.

Or should I have just walked away as my older brother suggested. He thinks I was still in the wrong and is also not speaking to me.
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Actually I think I'm feeling some guilt. Else I wouldn't even be posting this. But I just don't think I'm completely in the wrong.
I slapped back my mother, was I still in the wrong?
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