Hi Ben, i apologize for not commenting on this sooner. I didn't really understand it until now but i think i understand the meaning now or can give my opinion well enough lol. I believe the first and the last two stanzas make the poems meaning what it is.
It seems like you are stuck surrounded by things you do not want, clutter or love or possibly both. And in this case the end of the rainbow is not always a good thing. People say there lies happiness at the end of a rainbow but not in this case, in your case it brings anxiety.
I believe the third stanza is talking about anxiety, and how something always pulls you back into it. No matter how many times you try to swim to the shore (become free). You always get pulled back into what i think is anxiety from clutter. Physical clutter and metaphorical clutter.
So in short i believe this poem "debunks" the myth that there is happiness at the end of a rainbow. And the anxiety of that happiness (in reality another person's happiness, but you love that person so much thst you always get pulled back) pulls you back. You want to find your own rainbow so you can find your own happiness.
I loved the structure and meaning bdhind the poem, the rhyming was good and i don't see anything yhat i would change honestly. Well done.