What would you feel if you're seconds away from dying?

I recently develope the fear of time passing. That even a moment of me not doing anything to distract myself, will make me spiral into thinking about death and the passage of time. That maybe if i blink for too long, the ppl i hold dear will be dead. That all my favorite things with sentimental value will not last forever. Our house, my room, my bed, my books, everything I hold close to my heart will be noting after i die. That Im always one moment away from being seperated by everyone I love in a wooden box. I couldn't even get a single goodnight sleep after developing it last month. I hate that I feel like i'm in quicksand and everyone around me is slowly being drowned, while i struggle to get out. I want to know if im not alone in this. That there is a way for me to at least live my life and not be afraid of time passing by, that i forget to enjoy the moments that make life worth reliving.