Deimos,
I am right there with you. The shaking came with the released anger that I've held for 30 years toward my abuser. Then, when any significant anger surfaces, I shake some more and sometimes feel cold, too. As you said, therapy brings it all up to the surface, and the body will react to it. Why not? It's waited a long time to have it's say.
Now that it finally is getting the attention it deserves, It's going to get up on stage and dance; anger wants to move us. We feel compelled to take action, get revenge.
But yes, I have to keep telling myself that if I allow what evil people have done to determine my choices, then I will become evil, too. And I won't allow them to destroy me.
Besides, it won't release the anger. It will just add remorse and self-loathing to the pile. Instead, I try to detach from my self a bit and look at what I'm doing here on earth from a more spiritual perspective.
I see a hurting person, but a strong and compassionate person, someone who stands up for right and clearly sees the wrong. She finally can say "You hurt me," and push the bad people far away. She starts to allow feelings and to work through them. She is healing her wounded inner child, which is like having a new baby in house, one that cries daily and has so much unmet need. She feels the rage of that child sometimes so deeply that it frightens her, and she wonders how one person can contain THAT MUCH RAGE without actually having rabbies or taking PCP. The years of neglect and abuse take on perspective, and I no longer see it as something to avenge so much as something to grieve. Have to get down to the pain, below the anger, and allow that such pain is part of my earliest experiences, and that I survived the pain. I am strong.
Then I remember that I am and have always been me, and that if I could handle the anger up to this point, I can certainly still deal with it now. Somehow, accepting that it's there and will always be there to draw from, like a retirement account, allows it to settle from a rolling boil to a simmer, which alllows me to get on with my life.