This sounds like self-harm. Different from cutting or burning, but still self-harm...
In psycho-speak, they call it "acting out", because it's behaviour that is seeking to act out distressing feelings by physical or behavioural means. We tend to reach for self harm when, like you said, the feelings get overwhelming and we want to release them somehow.
DBT is really helpful for this stuff for a lot of people, because it teaches you how to cope better with the really distressing emotions better and to adopt other strategies (safer, healthier strategies) to manage the emotions before they get out of hand.
Last night? Possibly the idea of this coping strategy being taken away was itself quite distressing. That's also common with self-harm. Once we know that we can self harm and have control of the release of our emotions, it's really scary to have that coping mechanism taken away.
I go through some really nasty and very dangerous self harm phases myself. So I'm not gonna pretend this is a quick fix, or that it's as easy as it sounds. But ultimately, being able to recognise and then manage your own emotions in a healthy way is a huge part of recovery for a lot of us, and can really turn around your well-being overall.
Explained to the lay person, that sounds a lot like a petulant child being sent to the naughty corner till they learn how to behave. The reality is that the emotions you're experiencing are multiple times more distressing what the average Joe has to cope with, and NOT experiencing emotions (keeping them bottled up) is how a lot of us have survived our trauma in the first place. So what you're dealing with is big. Really big.
But there are strategies that teach us how to react differently, not need self harm, and look after ourselves the way we deserve.
You deserve to look after yourself. You deserve to be safe. And it's great that you've got support in place to give you the care that, one day, you'll be able to give to yourself.
It's rough, but you're heading in the right direction, so don't give up on yourself:)