Oh yes, I know it all too well :(
generally at least 6 months of the year is spent dealing with them in my case, usually in 2 month on/off cycles. Took 4 years for it to be correctly diagnosed and only just got some 'reasonable treatment' for it last year (been getting them for the past 10 years), after much battling for it through the NHS. Still nowhere near great as an effective relief, but it's better than nothing I guess. Sorry to hear you're a fellow sufferer :(

You probably already know the site, but if not, there's often some good info. and support here:
www.ouchuk.org/html/

and for those who'd like to see what it's like having a cluster 'attack', here's a video of a guy called Chuck having a cluster attack.
www.youtube.com/watch?v=UzpcPeoPnW0
( The Great Architect is still waiting for his account to be deleted on, Wed 7 May 2008, 18:16, Reply)