Does anyone else have existential moments worried about what comes after death?

28M and I've had two existential fear moments already this month. just general feelings of "...is this all there is?" and the like. Like, what happens after we die? Are we just wasting our lives? what even is the point of anything? I'm seeing gray hairs in my beard and sideburns, my dad is 64 and I'm terrified of what I'll do when he eventually dies. I'm terrified that I'm going to have a much lower life expectancy due to what a neuropsychologist had said to my sister a year ago. I'm trying to lower my cholesterol and I have this tender pain spot above/behind my right ear along with tinnitus. I'm pretty fucking terrified of dying.