It sounds like you've met with an incredibly powerful part of yourself. I recall having once seen the most amazing image that reminds me of this and of what you're expressing. It's an image of a female warrior on the edge of a cliff, powerfully screaming out into this massive expanse. It represents her arrival at this point. In my mind, I imagine she's traveled far and worked hard to get there. The scream is both her victory cry as well as her declaration that what now lies before her no one can take from her. That cliff's edge is the verge, between the old and the new, a liberating place to be.
Rage is a powerful thing. Constructive rage creates drive and change. It's like fuel for an engine furnace. Personally, I've felt such rage before and it's positively life changing. Developing ways to 'let off steam' is so important too, otherwise rage can do damage. Kind of like it goes from 'drive' to 'dis-ease', with the nervous system under pressure constantly.
I found one of the most challenging things about rage comes down to making my rage my own. What I mean by this is no one can add to it and no one can take away from it. I'm in charge of it 100%. Not easy to achieve at times, that's for sure. I'll offer an example. Just say someone says, while smiling (grrr), 'You need to calm down, you're completely out of control'. The comment and the smile especially can trigger more rage. To begin with, you're happy with your rage, as it's the one thing driving you to stand up for yourself, to be upstanding. 1) They're trying to manage your rage, by telling you to calm it down, something you don't want to do for good reason, and 2) they may actually be adding fuel to the fire, leading such rage to become a little out of control. Often, out of control rage leads to regret. Most of us don't want to regret becoming the person we don't want to be, such as someone who physically hits a person or burns a bridge that was going to take us to exactly where we needed to go.
I smile when I think of the kind of Marvel or DC comic character who transforms into a super hero through the power of rage. When they discover this ability, they have to learn to master it and have it serve them and those around them, otherwise it just doesn't work the way it's meant to.
With rage, I employ the sage. It's like the bi*ch and the sage in me working together. It's the sage who keeps a leash on the bi*ch. The sage that remains in charge of the bridge burning :)
You're powerful :)