Yeah the beast can morph like a bastard when he puts his mind to it. Sadly your experience is not that unusual, a treatment that works great for several years all of a sudden comes up empty.

What else do you have in your arsenal? Any decent abortives such as oxygen, imitrex injectables or nasal spray? Has your doc tried any other prevents such as verapamil, lithium or topomax?

If you haven't already looked at it, go to the post in this section, "123 pain free days and I think I know why" A simple vitamin/anti inflammatory regimen, good for you even without CH, and it's providing a lot of relief to CH'ers who try it.

Then visit our sister site,   clusterbusters.com and check out some of the alternative non main stream medicine treatments. Helping a lot of people over there.

Good luck with the surgery.

Joe

Applenutcluters....where did you come up with that name!! lmao  , Anyway...I was nervous about being put down and getting a cluster while under and then waking up in horrific pain, but as it turned out that did not happen. I do the imitrex injections with the onset of a cluster. My legs look like pin cushions having to give myself up to 8 to 10 shots a day for the past 15 days. I use the vial so I can control how much imitrex is going in. I find the self injections gives me too much imiterx at one dose. I usually only use 1cc per injection, so I can get 3 clusters out of one vial instead of just one cluster the vial is intended for. I did try the oxygen tanks and found them not to help that much.
Since the surgery yesterday on the growth(s) on my vocal cord and the reduction of tissue in my nose, I have had NO MORE CLUSTERS  , I had a gut feeling the growths had something to do with why these clusters seemed abnormal. I just hope this means I am at the end of this cycle...I am more then ready to put the beast to bed again. I am still going to read up on the D3 treatment!! I hear D3 helps with a lot of other issues besides Clusters.
Thanks 

AppleNutClusters = I work for Apple retail and I'm a crazy guy and I get clusters. 

I was just like you - about to be put out for surgery, and more worried about coming out of it with a CH than I was about the surgery going well. I made sure the post-surg area would have oxygen available if I needed. I told my surgeon about it, too. And like you, I ended up coming out with no CH. (Just bad ear pain, which I got pain meds for.)