While I like a lot of the metaphor and comparison ideas in your first two stanzas, and the flow was really working for me, then the next two, not so much. I think I can explain.
While I think you intended the impact to be there starting in stanza three to bring the reader's attention to this other person and what they think or do to the writer, I find it very blunt and unquestioning. When poetry doesn't make me think, I get bored. I think there may have been a better way to rephrase things in a less harsher context while still conveying the speaker's emotions in the last bit.
When you put such an awesome expression like formaldehyde tears in a silver vase and follow it up with "I hope you're satisfied," a phrase long overdue to be kicked out of angsty, drama-ridden teenage romance (or something almost as spiteful) the meaning becomes less about the suffering of the speaker and more about how the speaker whines about this other person in a juvenile way making the pain less serious. I think drawing more focus to the speaker would help in turn bring focus on the emotions portrayed by the speaker as well.