So random story about myself that this chapter reminds me about: I had an obsession with death at around age 6. My case was really really bad. Every night I would have horrible nightmares and every day was full of constant anxiety (which made me both shy and reclusive in random spurts if somebody triggered a thought of death).
For me, medication fixed this particular problem (Venlafaxine at a relatively low dose was successful without side effects and remains successful nearly 20 years later). I still have a lot of other issues unrelated to this, but I can always look back at that period and think "well at least I'm not THAT bad anymore".