What metaphors are used in I felt a Funeral, in my Brain by Emily Dickinson?

"I felt a Funeral, in my Brain" is a poem in whichDickinson attempts to render into formal poetic language the experience of a mind facing its own collapse; the opening stanza presents the metaphor of a funeral that is used throughout the poem to convey the sense of this breakdown to the reader. Brain here refers to both the concrete physical organ and to the abstract idea of the speaker's mind; such dual meanings are used throughout the poem to convey the physical and mental effects of the breakdown.
Losing one's reason is like a funeral: the final interment and burial of rational thought.