I should have given a little more info. I've had CH's for about 25 years and was finally diagnosed about 15 years ago.
I use a mask that looks very similar to the one recommended that I bought from a fellow sufferer several years ago that made them. I think it was called a Clustermax mask.
I use a 15 lpm regulator and I have 7-E tanks. They usually don't last a whole week and the place I exchange them is over 40 miles away and they cost $15.00 ea. I've tried several prescrip. preventatives and non have worked. The only thing that's works so far is O2 for most of them. I have Imitrex injs. for the real bad one's that I use once or twice a day on most days. I tried 60 RC seeds for the first time last Friday and I'm going to give them a try again tomorrow. I sure hope they help!