scared of dying

i recently got really bad health anxiety for the past few months and now i cant stop thinking about dying and just not existing anymore/the transition from alive to dead. I always used to have sudden random moments b4 this where id be watching tv and id randomly jump up and start panicking about dying and it would automatically go after a few mins and id be fine, but now its here all the time and i keep thinking about what happens and scaring myself about not existing. I am a atheist M 24