Links to articles, papers and such related to Cluster Headache: Cluster Headache Reviews: Wikipedia http://en.wikipedia.org/wiki/Cluster_headache Nation Headache Foundation http://www.headaches.org/education/Headache_Topic_Sheets/Cluster_Headaches Mayo Clinic http://www.mayoclinic.com/health/cluster-headache/ds00487 Cluster Attacks http://www.clusterattack.com/ Support Groups: CH.com http://www.clusterheadaches.com/ OUCH USA http://www.ouch-us.org/index.shtml OUCH UK http://www.ouchuk.org/html/ Oxygen: http://www.ncbi.nlm.nih.gov/pubmed/19996400 http://www.medscape.com/viewarticle/713630 Occipital Nerve Stimulation: http://www.medscape.com/viewarticle/553448 http://www.cbc.ca/health/story/2007/03/08/cluster-headaches.html Deep Brain Stimulation: http://www.neurologyreviews.com/apr05/DBSClusterHeadache.html The Headache Tree: http://www.oregonlive.com/health/index.ssf/2010/03/oregons_suicide_headache_tree.html http://www.clusterattack.com/blog/wp-content/uploads/2010/04/Benemei-2010-Pleasant-natural-scent-with-unpleasant- effects-cluster-headache-like-attacks-triggered-by-.pdf