Do we even know for sure that incident was true? And, even if it was true, it is possible that maybe he had a condition that was under control, and that was a one-time incident; maybe he forgot to take his medicine?
What I wonder is, there seems to be several different causes of death listed for him. I've seen claims that he died of his mental problems, I've seen claims that he died of a heart attack, and claims that he died of stomach cancer. No idea which is correct, or if it was a combination of issues.