Yes, my son felt bad too. And the in between times were very enjoyable.
But it took physical separation for him to work through it. I was always a phone call away, but I could control how I was treated when it was by phone.

I think a person's rage can be about a lot of things. When kids are little and living in scary situations (like when parents fight with one another and yell and worse, or when one parent [me] is emotionally unstable and displays rage and an inability to cope), it is not just that the child learns by example, I think the child is soooo scared that they feel like yelling at the time but of course they can't; I think that rage gets buried. And I think when that child is trying so hard to become an adult and it feels overwhelming and frightening, rage is the response to push the world away because it is just too scary on one level.