I had similar feelings in my experiences. Traffic had come to a stand still on the freeway in the rain and I heard a terrible sound and I looked in my rear view mirror and I see an 18 wheeler that had jack knifed and was coming straight at me. I had a total sense of peace and just thought oh I'm about to die. Total peace.

I had another experience when I went over some train tracks that I thought were unused (no flashing lights or crossing barrier) and I just crossed the tracks and looked to the right and there was a train not terribly far away. There was that same sense of peace and the same thought oh I'm about to die. Total peace.

I still have some fear of death but I remember that sense of peace. If this becomes too distressing for you or starts causing intense anxiety, can you talk with a therapist to help you process these feelings? Best wishes.