I very much empathise with Armstrong's statement about cancer being his terror. I had a bone tumour 15 years ago and everything was sorted within 5 years. However I know that if I find the tiniest symptom of anything similar, the years just fall away and I feel as frightened as I did then, if not more so (I now know what's coming). It's not a case of "you've faced that fear, you can conquer it now", more of "you've had to deal with that once and don't know if you could again", if that makes sense.