I always imagine myself dying in the same way

Not too long ago, i think it was tuesday i imagined myself dieing, by hanging on some sort of stone ledge, concrete, i'm not sure. It came out of nowhere, i was just browsing the internet. I imagined every single detail so clear, me hanging on both of my arms, then suddenly one becomes loose, i start to panick and the thought that i'm about to die sinks in, my fingers slip in a few seconds and i can feel myself falling, i feel not a pain, but a sort of pressure on the back of my skull, i feel the taste or smell of iron, the kind that you get from a nosebleed, and my eyes shut. I have no idea where this could come from or why it started, maybe i'm remembering a dream, from which i had no previous memory, but mainly i just want to get this thing out of my head, it feels too real, and i think i might start fearing heights soon. Thanks in advance, Julius.