I'm really impressed with your improvement since "Bitten". You have some really nice elements in here, but there's a lot you can do to bring those elements out more effectively.
The first line serves as an intriguing hook, but I find "restraints" and "chains" to be redundant. Try changing "restraints" to something that will serve the same purpose meaning-wise, but conjure a stronger image. I also suggest taking the second sentence in line 1 and making it its only line. This will make the flow more consistent across the stanza. The last line of the first stanza, while intriguing, creates too abrupt of a change for the stanza to work well as a whole. I'd like more explanation of this "bargain" rather than the jump in direction. Also, I'm not entirely sure what "Burnt bruises on the lids of a past." means. Read that bit over a few times and think about whether someone who isn't in your head could understand what you're trying to say, and whether you can find a way to make it more clear.
In stanza two you use some unusual capitalization, which can potentially be effective, but right now it's falling short. Why is "Nights" capitalized? I'm not necessarily saying that it shouldn't be, but if you had a reason for capitalizing it, you need to let the reader in on that reason so they can understand what's going on. Don't be afraid to slow down and explain. You also capitalize "He". Usually this is meant to be a reference to god (ex: "In His glory"). You also have some church imagery later in the poem, which lends some support to the god interpretation. From that interpretation, it's one of my favorite parts of the poem, and beautifully executed. The first two sentences in stanza two would flow more nicely if combined into one sentence, and will be richer if you use a stronger, more original description than "cold". Cold nights are common enough in poems that they start to edge into cliche territory. I also suggest looking at the length of that first line. It's much longer than most of the other lines, so you might want to break it up into some shorter lines.
Stanza three is comprised of two bland lines followed by one intriguing yet underdeveloped one. If you move the last line to the beginning, it will link directly with the "He"s and make that reference much clearer. I also suggest changing the "church, pews, and people" to three human elements, as addressing a pew is pretty odd. There are plenty of options (preacher, minister, angels, congregation). Get rid of the other two lines and follow up that initial call with an expansion of your "I'm on fire" idea. There's a lot you can do with that, run with it.
Stanza four is beautiful, but it doesn't have a clear connection to the previous stanza, so the abruptness of it dulls some of its strength. I also suggest changing "every night" to "tonight". It gives the section a much more imminent and direct meaning.
"Did I do this to me? This burning, this inflammatory illness..." I don't like this in there. The illness reference is new and never developed, and you have enough strong ideas to not really need it. I would remove it entirely.
Stanza five struck me in the same way as the previous line. The metaphors are never developed, and in all reality, never needed. Although they have some potential on their own, they just don't fit into the scene you've built. Try replacing the stanza with something that will transition the reader into your last section.
I loved your last stanza, but I want you to play with the "Protect me" and see if you can give the piece a final line that fits better into the story-as-a-merciful-end idea you've built.
I loved this. You have some absolutely beautiful ideas lying under the surface, you just need to tighten them up so the poem is a single coherent progression of thought and emotion. Fully flesh out your metaphors and images, then tie them together. If you can pull that off you'll have something tremendously powerful.
