Two grammatical/spelling things that I would fix:
in the third stanza, third line, I personally think this would be better:
'then confess mine to be darker' instead of 'me'. It goes with the previous sentences better. (in my opinion)
and then in the last stanza, second line, I think you meant 'what' instead of 'that'
Though I do really like this poem, the ending seems a bit abrupt to me. Perhaps a one liner at the end?
I like the idea of 'pouring' the sickest dream. I don't know, it kind of resonates and gives me the chills.
I like it!