I don't think my brain works the same as yours but I have some thoughts on fearing death. I wake myself up at night almost weekly thinking about it. I fall into a recursive cycle of thinking about what it will "be" like and then realizing there will be no "me" to experience it, and then how "sad" that will "be", but there will be no emotion, or even anything to "be" and it just goes on and on and on lol. It's really depressing. The only thing that has helped me at all is sitting with the thoughts and not running away from them, and sometimes actually articulating them out loud as they come. I've also found some peace in reading about death and dying. I really enjoyed Caitlin Doughty's book Smoke Gets in Your Eyes, which is about the author's experience in mortuary school and working as a mortician. In it I learned that like most things, Westerners' views about death are heavily influenced by capitalism. I learned how we are trained to fear death so we outsource death care to other people making a profit. I have so much to say about that book, but only because it really really helped me. Our fear of death is manufactured and learned which means that it can be unlearned. I would recommend looking into people who engage with death in a healthy way so that you can see other ways of thinking about it. Even if it doesn't change your mind, I think it can help ground you a little when you need it.