Sounds like the seed of a premise for a Rick & Morty episode.
Something-something... then the things from the other dimension come through the portal into our universe.
The bad feelings turn into three Cronenberg lasagnas: a nihilistic Cronenberg lasagna, an existential Cronenberg lasagna, and an absurdist Cronenberg lasagna. Similar to the ghosts of Christmas in A Christmas Carol, the Cronenberg lasagnas take Rick and Morty on different journeys to teach them how to deal with bad feelings.