Rainbow down my throat

I've got a rainbow stuck down my throat.

If I swallow it will dissolve into the cells of my body and I'll become luminous/numinous - rainbow alive forever.

If I cough it up, the rainbow will retreat to the parallel dimension from which I drew it.

I can hardly speak and everyone knows.

No matter what I think, all the colours come as one piece, and there is only the blend - only the sequence without any possibility of severence. I must take it as whole.