I've been suffering cluster headaches for 10+ years, usually, November/December cycle begins and ends in the Spring. I had tried EVERYTHING to deal with them & finally my doctor said "Let's try supplemental oxygen for this!" He prescribed me a tank & when I feel a cluster headache starting up, I turn the setting on the tank to 8 & breath the oxygen through a facemask for 5-10 minutes and the cluster is gone! It never gets to the point it is unbearable because the oxygen knocks it out before it gets to that point. Why did it take over 10 years to get to this point and why don't all doctors do this? My health insurance was paying almost $200 a month for the supplemental oxygen with a $30 copay to me. I would have paid ANYTHING for this years ago! A local oxygen retailer signed me up as a private pay for a total of $10 a month for the rental and $5 per tank. (Now we know why insurance premiums are so high too!!) Just thought I'd throw this out there... maybe it could change your life too!