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Wow! I really enjoyed ready this. Especially that ending! Here we go!

1. I have to start with the ending. I just gotta. It's really powerful and as soon as I finished I looked up at the title and just a great, big (awesome) "Oh, huh!" And read it again. Bravo.
2. I'm a little vague on who the voice of this poem is (someone in love with someone sick/or the illness itself) because there are lines that make me go one way or the other. My best guess is that its someone in love with a sick person. Which makes the end powerful in a very sad way. While I don't think this needs anything explicit in anyway, I think a very light nod to the speaker would keep the focus on what's happening here.
3. I could do without so many of the "I'll and I'd and you'd"
4. Really like this, little for me to critique!

So... ABCA may work better as ABBA or ABCB. Good attention to meter throughout. Punctuation needs work for consistency, especially when you've nominally got 4-5 sentences strung together throughout.

Narrative-wise, not bad, but there's some cliche bits - 'you weary of it all' and 'so every breath you took would have', most noticeably. I'm not sure that the internal senses work in combination with external senses that well - rhythms as verses as hearing through the blood as fear relief, vision cleansing as depression lifting as expression of love, pain tasting as (what I think is a reference to either drug withdrawl or Parkinson's; IVs aren't meant to still veins so much as support them), etc.

I'm also uncertain as to how well the idea of a parasite works in this instance - it starts out small, ostensibly, to the extent that it'd be on the level of alveoli, but somehow ends with 'wrap you up in me' (yet I don't see the massive growth spurt through the piece).

That all said, 'I'll blue your lips and seal your eyes' is solid, and worthy of expansion.