I understand why you would be so frustrated. I am trapped in this world because of limited access to methods and more than anything I wish that it is easier to leave. I have never attempted hanging as I fear it going wrong in some way and it sounds like a difficult method because of the SI.
We all deserve the option of a peaceful exit at a time of our own choosing, suicide should not be this difficult. I'm sorry that you are in this unbearable situation. I know that it is awful desperately wanting to leave this world, yet feeling like you are unable to. I hope that you find relief from suffering.