Ah he explicitly talked about having troubles, I thought you where speculating based on your divination of his writing in context of this discussion.
He didn't talk about how the tour de force creativity runs felt (as far as I've found so far), I'm taking his observable body of work as evidence of them. So looking at his body of work and seeing mania as well as depression is surmise on my part.
Link
One of us is no more.
He deserves a eulogy more eloquent than what I am capable of writing. Here's Cory Doctorow's, one of his long time friends.
It's a sad world in which you are being arrested and grand jury'd for downloading scientific journals and papers with the intent to share them.