That was totally impossible to do. I could speak those things out aloud, but I couldn't really do them inside my head. If someone asked me a question, I couldn't prepare an answer in my mind before speaking. And those existentially depressing places my thoguths sometimes goes to were also not accessible.
I expressed it to those around me as "I can't think", which was obviously not completely true, but I think I was so focused/grounded in the pretty overwhelming experience that my mind couldn't really waste CPU cycles on wandering or evaluating what the best answer was to a question.