Oh my goodness, NO!
Please don't do this. The pain of bleach on your mucous membranes will be incredible, and not in a good way.
As strong as you are, and as much pain as you have suffered, you can not imagine such a burning, searing pain. Like swallowing a thousand red-hot razor blades all at once.
Death is not instant. As that white hot ball of fire makes it way down your chest, you will give anything to be dead. But you will not be. You will be alive, and awake, and suffering. Your body will desperately try to expel it by pushing up, but your mouth will do anything to keep it from coming back, pressing that bubble of pain until you wish you would explode.
All of this will take seconds but will seem like a million years. If you pass out from the pain, you will be one of the lucky ones.
When you wake up days later, you will have lost the ability to speak. You will want for death every.single.second. The pain cannot be well controlled.
You will likely end up in psych ward, unable to talk or advocate for yourself.
Please, I beg of you, don't do this.
