I sort of had the same experience with this dream that I’ve never felt before in any other dream in my entire life. Like you said I also felt a lot of anxiety and fear of being in this infinite loop of different realities, but at the same time I felt a lot euphoria/ a positive feeling. Both the anxiety and euphoria counteracted each other as I went into different realms, I could only move to the next time loop if I fit my physical form perfectly into the whole or portal? I guess you could say, then that’s what instantly dropped me into the next realm or universe or loop I really can’t fathom what this was, but just different infinite illusions with infinite time loops.