How would you describe the form of the poem, "I felt a funeral, in my brain"? Is it an appropriate form for a poem that seems to be about dying?

The poem "I felt a Funeral in my Brain" by Emily Dickinson is in the form of an allegory, a tale with a literal level and one or more symbolic levels; the funeral is an exterior structure that gives coherence to the speaker's mental state.  Because the loss of the speaker's mind is simultaneous and tortured, the funeral provides a symbol for what transpires in the speaker's mind, a symbol that does not reveal the inner thoughts of the speaker, thus allowing her feelings some privacy.

Without the structure of the funeral, the reader might have no idea what happens with the speaker's mind.  The images in the second and third stanzas clearly convey the speaker's growing sense of despair, and the images in the fourth stanza convey her sense of isolation.  Finally, when a "Plank in Reason, broke" the reader understands that the speaker has lost her mind.