i have experienced a similar effect with vaped DMT on high doses of LSD.
basically my apartment became a "different place" (for lack of a better descriptor). physical objects changed, there was no clutter or earthy familiarity. in fact, things that i did recognise (my beautiful gretsch guitar on a stand right in front of me) took on completely different characteristics. it was an instrument, of some sort....but not a guitar. the darkened, candlelit flat became illuminated in a creamy white light, and objects stretched into oblong shapes and what seemed to be different kinds of technology.
to me, this is 'open eye hyperspace'. there may be other ways to describe it, but it's mystical and wondrous.
lots of particular shapes and a beautiful, yet somewhat haunting eeriness. i love it, but i find it hard to get that sweet spot between "oh wow, that was pretty", "holy fuck, i'm confused" and "i've just been shown that a giant parasitic alien is feasting on the planet, and i am paralised with fear and guilt that i am complicit in feeding it with my embracing of the destructive evils of modern technology".
dmt can go deep, deep inside your head and pull things out to taunt you. this is my subjective opinion.
yet, i have fallen in love with tryptamines. over the course of yesterday i consumed moderate doses of 4-ho-det, 4-aco-dmt and dmt (IV, plugged and vaped, respectively) over the course of 12 hours or so - as well as a little 2c-d which took some of the edge off the (somewhat recklessly experimental early morning shot of 4-ho-det). after vaping some dmt at the end, rather than being overcome by the power i am accustomed to with such a ROA, i simply found my vision completely immersed in elaborate and gentle patterns. it was beautiful, but these things can so easily fall into a frightening train wreck if one is not careful.
i'm a very experienced tripper, and only really began exploring the various tryptamine analogues this year - but if you know your self, your mind, your set+setting and your substance, you can really explore some fascinating realms in these states - but push it too far, and you are pretty certain to wind up hovering over some kind of frightening abyss.
dropping unknown tabs in combination with a fairly high dose of any of the NBOMe series seems pretty irresponsible - in the life threatening sense - and i'm glad you're ok.