Cluster Headaches http://www.clusterbusters.com
Further research into the possible elimination of chronic, severe and life altering headache pain, cluster headaches, through the use of hallucinogenic substances, which have proven to be more effective and less destructive to the human body, than traditional treatments.
OUCH (UK) http://www.ouchuk.org
Charity and expert patient group dedicated to helping cluster headache sufferers in the UK. Find support and membership details.