Blocking someone closes the door. Healing is what you do in the room after.

Cutting contact can be exactly the right call, and it does stop the bleeding. What it cannot do is finish anything, because the argument keeps running in your head long after the notifications stop. The block handles them. It does not handle you, and that second part is slower and nobody can see you doing it.

Give yourself something to do in the quiet afterward. Talk to one person you trust about what actually happened, and notice when you are rehearsing the fight instead of living your week. If it still takes up most of your head a month from now, that is worth telling an adult you trust.