Hi all. I have now gone from chronic to pain-free. This is not BS. I have literally not had even a single CH since early March of 2017. And the answer to how I'm pain free will be surprising because I now believe the cause of my CHs was 'staring me in the face': my pillows, mattress, and every other source of dust mite protein accumulation.
Here's my story.
As some of you may know, originally, I had managed to break my chronic CH cycles (I was episodic from 2007, and went chronic in mid-August 2014) with a combination of NSAIDS (Vimovo+D3) on a daily basis (back in Dec. 2015), but the CHs returned after about 10 months (in Oct. 2016). At the same time, however, I also experienced something that would prove a sort of Rosetta Stone for understanding the cause of my CHs: a skin rash. In retrospect, for most of my life, I simply thought I had itchier skin than most other people. I would periodically get a bump or a few bumps on my skin in different areas, but I never really paid it much mind, as they seemed to disappear nearly as soon as they occured. But by Nov. 2016, exactly along with the return of my CHs, I also had developed an obvious enough skin rash over a significant enough portion of my body that I went to the doctor for it. She confirmed with a biopsy that it was, in fact, a histimine (allergic) reaction. She gave me cetirizine, and that did reduce the rash to the point that it was almost gone, but the CHs were still pretty much daily. I waited until early March, 2017 for the allergist appointment, but just before that, I went to Cuba with my wife. There, despite taking vast quantities of Benadryl, (at one point, at the maximum dose every 4 hours for the last 4 days) and Cetirizine, I was still getting hit with 2 and even 3 headaches near the end of my stay. The rash was also coming back, though it subsided somewhat after my daily shower for a while, always to be worse in the morning. Suffice to say that, by the time I came back from Cuba, I felt like I was nearly dying.
Then my allergist appointment came up. Within minutes of the administration of the test, there were 4 large (about the size of a quarter), red discs on my left arm, right near each other. "That's dust mite protein," said the nurse who had administered the test. The allergist also confirmed the results. "You're not allergic to the dust itself, per se, it's that you have a VERY strong allergic response to the proteins found in 'waste' (ie. shit) of dust mites." B I N G O!!! This all made sense!!!! Finally! Of COURSE I would wake up with a CH within minutes of putting my head down on a pillow, or after lying on an old sofa, or after letting my cat lie down next to me. I'm ALLERGIC to dust mites!
But as a 10 year veteran of CH, I was a little skeptical. I had taken an allergy test many years ago, when I was about 18, and although dust mite protein had shown up, it was a fairly mild reaction back then. I had to absolutely confirm/deny this new theory. Perhaps I WAS allergic to dust mite proteins, and they were giving me rashes, but were not linked to my CHs? But I had to give this a try. So I went immediately from the allergist's office to the Bed, Bath and Beyond store and bought a dust-mite proof queen-sized mattress cover, and 4 dust-mite proof pillow cases. I also wiped down every single surface in our bedroom (there is no carpeting in our new house, so that's a very good thing), and this is very important, I also changed all the bedsheets. I then took my usual cetirizine, trazadone (a sleeping aid) and 10mg melatonin supplement that same evening. That night, I had the most complete, deep sleep I had had in literally years. Not only did I not get a CH (and I had been getting them chronically again for 4 months leading up to that very night), but I did not even wake up to go to the bathroom, or for any other reason. I simply slept soundly for about 9 hours. I actually felt rested for the first time in years. Due to the success I started having with reducing my dust exposure, I also decided to start taking allergy desensitization injections. I've just recently completed the one year weekly regimen, and now I'm on the once every 3-4 weeks routine.
Since that night (March 10th, 2017), I have not had single CH. My regimen was simple. Cetirizine (max dose daily until you can reduce--see below). Dust-mite proof covers on the mattress and pillows. They don't have to be expensive, but they DO have to explicitly say they protect against dust mites. If they don't mention dust mites, they're probably not fine enough mesh. I use 'Protex Premium' brand, like these:
pillow covers: Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

mattress cover: Multimedia File Viewing and Clickable Links are available for Registered Members only!! You need to

or

But it's not enough to have mattress/pillow covers. You must also remove dust mite dander from your sheets and pillowcases and comforter every two or three days. I change the bedsheets/pillow cases religiously every 2 or 3 days, and I wipe down the bed frame and the only other two pieces of furniture in the room, as well as the floor. Bascially, I reduce my exposure to dust as much as humanly possible. I don't sit on old chairs unless they are leather. I don't sit on old sofas if I can help it. I avoid places as much as possible where accumulations of dead skin will build up. I even got rid of my old sofa and bought a slightly used leather one, because pillows, sofas, mattresses, etc., are repositories for dust mite crap (protein).
Even this, however, is not enough on its own, so I have also initiated the allergy injections. The injections will probably take 2-3 years to complete, but this really seems to be working.
So, to recap, my 'cure' for my CHs is simply:
1) This is the first, best, easiest and cheapest step: Dust mite-proof pillow and mattress covers (also cover/remove any duvets, as they are probably full of dust mite protein, too)/dust free sleeping environment (sorry, no kitty cats or dogs, either--they are covered in dust mites). Also, stay away from places/furniture that likely contains high concentrations of dust. They will overwhelm every other provision you are taking.
2) Cetirizine daily -- maximum dosage, until you have gotten far enough along in your dust mite allergy injections to slowly reduce your dosage)
3) Dust mite desensitization injections. This is perhaps the 'cure' part of the treatment, since, in theory, you will never get another CH once you have successfully completed the desensitization process. These will start out as weekly for about a year, then become every 3-4 weeks for perhaps 2 more years.
So far, after a over a year, this has worked for me. I hope all of you with CH will read this and at least try out what I did. If you're chronic, as I was starting in August of 2014, you likely have nothing to lose and everything to gain. I got my entire life back, and I hope at least some of you out there will, too.