You beat me to it lol !!!!!!
On BBC:
Speaking about the time prior to his diagnosis, he said: "It started with a series of cluster headaches and sweating - I was hospitalised. I thought I had a brain tumour - after tests they said this was the situation. It's a hard three letters to absorb."
http://www.bbc.com/news/entertainment-arts-34845630
Surely he had clusters before his diagnosis??
(Yes, of course he did, and please dont call me surely again)