hmmmm... good question.... we also try to hide it.. But like you we've an alter or two that harbor a lot of anger. The younger one is more emotional about it but tries to shut it down; the older one lets it out as sarcasm which has a lot less bite than it used to - once we realized how much words can hurt. Back then (long before therapy) we also had uncontrollable rage... blind rage. I'd try to contain it for so long and then BOOM! it was like an explosion. Once it got away from me, I had no control, and that really scared me. I finally learned to internally grab it (dunno how - just did it one day when I could feel it escalating).
But talk about it? We also deflect.... My newest T noted on day 2 "There's a lot of anger there". We denied it and tried to bury it. T's trying to draw it out but it scares me. I don't feel like I can control it and I don't want to turn into a thunderstorm, with lightning frying anything it touches.
Can you post what you learn as you go? We could learn together.