Weird thing is as a kid i did abseiling and rock climbing My fear developed as i got older. Few years ago in Oz, i was walking across a rain forest walkway about 50 feet up on a slippy surface and somebody bumped into me and made me slip, i overreacted bigtime through fear. Another time walking along a cliff top, the ground opened up and within 10 feet was a huge vertical drop, yet again the human slug took over as i lay on the floor and crawled away........