Months after the sixth session, I had the first session of what's supposed to be a series of four monthly sessions. The first such session (which makes for a grand total of seven overall) had no impact on me, and that led to me despairing ketamine was actually no cure at all for me and that all my hope had been in vain.
However, I was eventually persuaded to give it another try, and the subsequent session was a breakthrough. It dispelled my extreme depression and helped lead to more revelations.
During the camping trip I went on with brother and father, I felt enough clutter had been cleared from my mind to realize I'd hit the upper limit on the usefulness of rationality in coping with my emotional state. I needed to rely more on emotion and exercise to improve my mood.
I also think I've finally figured out the answers to the meta-ethical questions that have been perplexing me for years! I can see why The Doors of Perception has a philosophical bent to it. I've never thought of drugs as a philosopher's tool before, but I'd imagine it's akin to Siddhartha must have experienced when he was in deep meditation, trying to figure out how to live a good life. I also think it must be why A.I.-generated works of literature like this reads like something written by someone on on acid trip. The computer lacks preconceived notions, and taking drugs can clear your mind of preconceived notions.