I heard a fly buzz when I died

In this poem, Emily Dickinson acts almost as if she might have ADD because of how random her thoughts are.  In some peoples cases, they can be talking about one thing and get completely side tracked and start talking about something else in an instance.  Like in the move UP, the dog is just talking normally and then he yells "Squirl!" randomly and out of context because he got distracted.  In this poem, Emily is talking about a person lying on their death bed and about to die when a fly distracts this person from dying.  Such a generic and simplistic insect was able to draw this persons attention so much at to bring them out of death, or at least that's how I interpret it.  I figured that this type of ending could be taken two ways in that the person could be very happy about this happening or the person could be very sad about this happening.  If it were to be taken in the way that the person is happy, it would be because the person was stopped from dying and gets to live a little bit longer, but if it is taken in the way that the person or audience is mad or sad about the person dying it would be because the fly stopped this specific individual from completing all of their tasks they needed to before dying or that the person that was dying was prepared and ready to die, but thanks to the fly they didn't.  Both ways seemed reasonable to me, I feel that it is just up to the reader and the way they interpret the poem to choose how they want think and feel about the ending of this poem.  I think that most of the time the poems tend to be interpreted pretty close to the same way every time this happens except for like one little part that could be taken two completely different ways and it depends on the reader and their feelings toward the subject to choose how they want the story to end.