Sounds like it could be mild dissociation/depersonalization. It's not typically considered a primary effect of psilocybin, but there is a small mention here on classical psychedelics: https://en.wikipedia.org/wiki/Dissociative
I was already predisposed to anxiety, but after using LSD quite a bit in my teens, my anxiety took over my waking life. During high anxiety and panic attacks, I often experience dissociation/depersonalization effects. I feel like I am disconnected from myself, and watching what is happening, like in a dream. The only thing I really connect with is the anxiety and fear. Over the years, through therapy and medication, this has become rarer.
It is very interesting to note that the same depersonalization is experienced after a long, deep meditative practice. I realized that this meditative depersonalization was same as when I was really mad.
I actually had to change my meditation practice from deeper states to mindfulness meditation, because I would get that depersonalization feeling. Strangely enough, being angry would break me out of that state.
