The jellyfish might be issues you struggle with - an itch you will need to scratch. There's also the notion of thoughtforms present - when seeing them as entities (their consciousness aspect) Kurt calls them Creatures.

The walls form an interesting perspective and could yield a clue to the energy body you were in. You can sense the limits of the plane here.

The complex you visit in the dream about your mother might have been her worldview. Notice how the whole scene's setup relates to her. You try to get to the interior to understand the heart of the matter, and you try to do so from an elevated perspective but you cannot achieve the necessary state of consciousness on this occasion. (I have one past adventure on record where I got access after changing perspective, but before the landing I was on had no exit.) It is within your reach, however, as you have the necessary inner senses to navigate this place and find the way there.

The trampoline would then represent a lot of ups and downs, issues having to do with drama. Very black mothers wrapped in white cloth could mean the problems originate (motherhood is origin) in black-and-white thinking, and the babies symbolize seeing them played out to learn from them. The African mothers could also denote the soul-level (black people I often connotate with "people with soul") learning derived from seeing these things played out in physical reality. The great number of them could denote repetition - that some lessons need a lot of repetition to be driven home.