So sorry to hear you are in a bad place. How is your relationship with your t, I ask because I am concerned you are asking if you should tell them and that you didn't reach out for support before you attempted to hang yourself.
I feel so sad that you are so alone in this. I really encourage you to tell your t. This is not attention seeking it's the behaviour of someone who is hurting very deeply and feels like they can't tell anyone. My heart goes out to you. Are you still at risk tonight?