I was scared shitless when I came across someone that cared, I think he was also to be honest.
Certificate III and IV in Fitness are the qualifications required to become a personal trainer, then some specialise in different areas (strength and conditioning etc.)
I think it's so hard to accept because people don't understand it, sufferers are often embarrassed about it and generally it's been seen as pretty taboo topic to talk about. Nobody want's to be the "downer" so they bottle it up and try to pretend everything is OK or that they are dealing with it until it gets too much.