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I have been fortunate enough to be able to work through my cluster headache attacks - however I have been fortunate enough to read the shadows as soon as they emerge. I often take a couple of Advil and if there is no change I go straight for the Maxalt.
This hasn't always worked and on occasions I have locked myself in a toilet cubicle and rode it out for however long it takes - sometimes up to an hour.
My advice to anyone who suffers from this hideous pain is to notify all workmates and people withon your workplace that you suffer from cluster headaches - describe the pain, get them to Google it so they can get their head around what you are going through and if you get a shadow lay low for a while.
I have had attacks at my desk where people around me thought that I was reading something really sad with watering eyes and runny nose - in actual fact I had my eyes closed and was grimacing in pain - keep your back to all.