need help with a poetry explication of emily dickinson i felt a funeral, in my brain?

[HMOL]

here's the poem:

"I felt a Funeral, in my Brain,
And Mourners to and fro
Kept treading--treading--till it seemed
That Sense was breaking through--

And when they all were seated,
A Service, like a Drum--
Kept beating--beating--till I thought
My Mind was going numb--

And then I heard them lift a Box
And creak across my Soul
With those same Boots of Lead, again,
Then Space--began to toll,

As all the Heavens were a Bell,
And Being, but an Ear,
And I, and Silence, some strange Race
Wrecked, solitary, here--

And then a Plank in Reason, broke,
And I dropped down, and down--
And hit a World, at every plunge,
And Finished knowing--then--"

i definitely need some help explicating this
any and all help is appreciated