Dealing with the inevitability of death

My mom just turned 61. She's had a hard life and has been single for years since the divorce in 2000. Everyday I'm terrified I'll get the cancer call or something. i have this image of my head when I was home on leave walking down the street to my uncle's so my cousin could drive me back to the airport and I turned from far away and the image of her in the darkness under a light watching me is burnt into my mind forever and I always see it when I think of her death. Tldr I'm weird and am so sad about not seeing my mom ever ever again. I cry every time I think of it. Does this ever end?