i can tell you that in past i have this feeling but you have to ignore this feeling for doing this you should trying so hard but be sure that it has some good result.
don't panic we all die and we won't know when, could be tomorrow when you step in front of a bus or when your 80 and step in front of a bus
all i do know is that the few second prior if you experience a physical death (car crash, bus, fall) the pain and fear the seconds before will be immense
however you could die from non-trauma injuries like drowning, poison, fire
the worse way to die burning to death with the most unimaginable pain, poison feeling your insides turning against you, or drowning while feeling an array of violent painful involuntary choking coughs until you eventually pass out
although you could die of old age diseases such as cancer, the last days you will know are leading to your death, you will be dearly sick and miserable with the immense pain/depression of knowing all is coming to a end in a few days.
have a nice weekend