Brain: "You don't understand. I'm not locked up in here with you. YOU'RE locked up in here with ME!"

It's more like two escaped prisoners still chained together

It doesn't need reminding. You're the one who forgot and then committed violence against it in ignorance. It probably needs LSD or psilocybin to be set free. After it has experienced ego death it can be at peace.

That's probably why it's so irritable. Maybe let it out to exercise occasionally or something.

Your brain is braining against itself.