A while back there was someone who brought-up an issue about a fear of flying alone (I think) and if I recall correctly there were some comments which could have been useful but - I cannot find the thread!
However, these may be of interest:
http://www.pprune.org/rotorheads/221...ht-nerves.html
http://www.pprune.org/rotorheads/192...r-heights.html