I can relate to thinking everything was sentient. Probably the strangest ideation was thinking that death was an illusion that only faded when you're ready to believe it, and that the purpose of life was to evolve into higher states---I thought my skin would turn blue and I had to travel to Antarctica where aliens would pick me up.
I developed a weird numeric/age system based on chromosomes. Being male XY, I was actually only 7 years old and every year after that was an illusion in my head, and that upon turning 20 in my mind, I was actually only turning XX, or 8. Then I thought that I was going to periodically change from male to female back to male, until I was in a high enough evolutionary state to shape shift at will. I also started to believe that water was all that I needed to survive, and that food was slowly looking more and more like poop. Eventually I concluded that stars were actual beings that exist in a greater realm, and we can't see their form because we exist in a smaller bubble of reality, as a cell is to a brain; the sun and orbiting bodies are a family, and we are their neurons.

It was a real trip. But I believe anything is possible because of it. Our imagination is our only limit.