Clusterbusters 9th Annual Conference Presentations in Advocacy, Events and Conferences Posted August 31, 2014 I missed one of the speakers on the syllabus. Sorry about that, Hipshot! Â•Dan Ervin Dan is a 56 year old man who has experienced chronic cluster headaches since the onset of the disorder eleven years ago. He has tried most every medication available and every surgical procedure short of deep brain stimulation. Known as Â“HollywoodÂ” among the cluster headache community, Dan volunteered to host a National Geographic film crew from London to document his use of mushrooms to successfully treat cluster headaches.