I Felt a Funeral, in my Brain...again

This poem really irritated me and intruiged me all at once. What irritated me is that I could not figure out what it was about! While we should be focusing on imagery and literary skills (which I did, I promise), I couldn't help but wonder what this poem was about. At first, I thought it was about a headache. Now that I read it more thoughtfully, I wonder why I even thought that? Even though the imagery proves that it is happening inside the brain, I wasn't exactly right. The diction used leads me to believe the speaker is going insane. What I love about this poem is the metaphor that it's a funeral in his or her brain. The diction futher makes the metaphor more interesting and deep.