I have a couple DMT experiences that sound pretty similar. Most of the times I come back and I'm unable to recall most the experience, just left with that unsettling feeling that that something isn't right, lol.
This thread is of particular interest in the context of a profound psychedelic experience.
To me, in those moments, with the dazzling array of kaleidoscope visuals and fantastically impossible geometric arrangements, can feel more 'real' then the reality you come scuttling back to. But that's just a feedback loop of brain patterns being funneled through the visual processing centers of the brain.
Crazy stuff though. The entities are what get me the most.