Mortality and all its friends

I often find myself having more and more panic attacks about my own mortality. It’s gotten to the point that it gets in the way of living my life. Since highschool ive felt like death itself were chasing me, and that if I ran far enough I could escape it. I’m so afraid of death. I’m afraid of ceasing to exist and yet I also fear never ending eternity. Why? Why do I feel this way? I feel so trapped in my own mind all the time. I miss being little and simply living in the moment. Maybe I just need to be medicated.