Kemper ❤️ You

The call of the void is your brain's warning system crossing into your imagination to get your attention, as you posit. It's totally normal.

People who struggle with OCD, PTSD, etc are more likely to be caught in the thought and repeat it as a pattern, be troubled by it, become trapped in it and suffer anxiety, which - anxiety about anxiety is panic, so this feedback loop can easily turn into panic disorder. Very troubling once this all starts happening.

You can get rid of these thoughts by recognizing they're normal, acknowledging them, thanking them for keeping you safe, and moving on. Simple once you know how.

It's when you resist the thought - try to stop it - that you, ironically, get caught up in it, and it begins playing on a loop. This is true of any type of thought. Several types of therapy try to guide you to the point of simply accepting your emotions so you can move on and not be troubled by them.

I am not sure about this case at all, your brain also has several self-protective mechanisms that would keep you from doing this, normally. Some sort of psychosis may have been involved.