I think he had a hard time coming to grips with being that little boy on Different Strokes also.
Here was someone that should have had it made but according to what I have heard really had a miserable life trying to overcome that stigma of that one show and trying to have a normal life. Then look at the difficulties of some of the folks highlighted on the "Reality Shows".
I guess there is good and bad that comes with a celebrity life, depending on who you are. I know he had other health issues but 42 is a short life for most.