Whats the theme of this poem?

Question:its by Emily Dickinson

It Was Not Death
It was not death, for I stood up,
And all the dead lie down.
It was not night, for all the bells
Put out their tongues for noon.
It was not frost, for on my flesh
I felt siroccos crawl,
Nor fire, for just my marble feet
Could keep a chancel cool.
And yet it tasted like them all,
The figures I have seen
Set orderly for burial
Reminded me of mine,
As if my life were shaven
And fitted to a frame
And could not breathe without a key,
And 'twas like midnight, some,
When everything that ticked has stopped
And space stares all around,
Or grisly frosts, first autumn morns,
Repeal the beating ground;
But most like chaos, stopless, cool,
Without a chance, or spar,
Or even a report of land
To justify despair.

Best Answer - Chosen by Asker: its by Emily Dickinson

It Was Not Death
It was not death, for I stood up,
And all the dead lie down.
It was not night, for all the bells
Put out their tongues for noon.
It was not frost, for on my flesh
I felt siroccos crawl,
Nor fire, for just my marble feet
Could keep a chancel cool.
And yet it tasted like them all,
The figures I have seen
Set orderly for burial
Reminded me of mine,
As if my life were shaven
And fitted to a frame
And could not breathe without a key,
And 'twas like midnight, some,
When everything that ticked has stopped
And space stares all around,
Or grisly frosts, first autumn morns,
Repeal the beating ground;
But most like chaos, stopless, cool,
Without a chance, or spar,
Or even a report of land
To justify despair.

Unutterable depression? Hopelessness? Desire for an end?