I don't have any control over it when I lose my temper. I just go into a white rage.. its like a huuuge outburst. Things and people get destroyed when I am in a rage. The only way to stop it is to prevent it in the first place.
The idea is through therapy i make it so I don't need to have rages anymore (they are like an overblown defense mechanism apparently). I have no control over it atm because I have only been seeing this T for a couple of months. The therapy is so that I can replace the uncontrollable rages with something else. it is early days yet

But that is the plan like you said ... make it so that i can control myself in the rages and then do something instead of destroying people/things.
edited: oh i forgot about your other question. I have no idea where the rages come from because apparently I am cut off from my "vulnerable" parts. Accessing that is the main goal of therapy and will hopefully reveal why I get so angry over what seems like nothing.