Did you know high-flow #oxygen is the safest and most effective treatment for an acute #clusterheadache attack, yet the Centers for Medicaid and Medicare Services (#CMSgov #MedicareGov) will not cover it? Join us for a #Twitterchat (follow #O2forCluster) on Sunday 9/13 at 1pm ET/ 10am PT hosted by clusterbusters Visit AHDAorg on Twitter or FB to learn about the many different ways you can advocate, whether you have cluster headaches or not. #clusterheadache #clusterhead #clusterheadaches #chronicpain #clusterrelief #clustertreatment #invisibleillness