It's nothing to be concerned about. It could be a combination of you becoming more aware of sensory information that was already there or it's also been shown (in the case of rabbits) that some DMT remains in the serotonin vessicles for a few days following administration. If it's the same for humans, then it could account for the long afterglows/flashbacks in the following days.
"Science without religion is lame. Religion without science is blind" - Albert Einstein
"The Mighty One appears, the horizon shines. Atum appears on the smell of his censing, the Sunshine- god has risen in the sky, the Mansion of the pyramidion is in joy and all its inmates are assembled, a voice calls out within the shrine, shouting reverberates around the Netherworld." - Egyptian Book of the Dead
"Man fears time, but time fears the Pyramids" - 9th century Arab proverb