This is the mask (of which you can use just the breathing tube) that Denny was talking about: http://www.clusterheadaches.com/ccp8/index.php?app=ecom&ns=prodshow&ref=clustero2kit
The vitamin D3 regimen has helped a lot of people. The creater of that regimen, who has followed it closely, is Batch. I'd strongly urge you to contact Batch -- who will be happy to hear from you and will respond quickly and supportively -- to discuss the regimen for your situation. To contact him, go to the envelope icon at the top right of the page, and type Batch on the To line.
It's very rare for sumatriptan pills to work so well. You are fortunate in that regard -- thank goodness, since so little else seems to help you.
Many people here have ended cycles and even sometimes prevented them through "busting." Busting is why this site was created. You can read about busting in the numbered files in the ClusterBuster Files section of this board. If you want to know more, all you have to do is ask (preferably at one of the closed boards, such as "Share Your Busting Stories."