"As the plane got closer to Miami, I had this terrible feeling he was dying. Maybe he was telling me that he was going. I felt anger, panic, despair and helplessness"

The quote is most likely referring to a circumstance in which the speaker is on a plane, heading towards Miami, and senses that somebody close to them is passing away. The speaker is most likely feeling a variety of feelings, such as anger, panic, anguish and vulnerability. This might be due to the reality that they are not able to be with the individual who is dying, and are rather stuck on a plane, not able to do anything to assist. The speaker might also be feeling helplessness due to the reality that they are not able to prevent the death of the individual they appreciate. The quote is likely conveying the feeling of being helpless in the face of death, and the variety of feelings that come with it.