@Alan McDougall,
I have seen many sides of this coin. I am ADD myself, which is officially classified as a disorder and I will be the first to agree that it comes with serious problems.
But I would still rather see it as a difference. It enables me to think in ways that no one around me can follow.
Some of the people very close to me suffer from a wide variety of other disorders, up to and including schizophrenia.
It is said that the hottest fire forges the best metal and I tend to agree. Those that are hit hardest by the flukes of life often turn out to have the most wonderful characters and the most beautiful minds.