My headaches match some of the symptoms, but not well. The constant nature of it has changed to episodic flairups, but I've not noticed any real time based pattern to them. I do get the "droopy eyelid", and the one-sided congestion, and I did have a very minor head injury on that side several years ago, similar to the pre-onset history reported by many "clusterheads". But if it is CH, it's rather idiosyncratic. It is the worst recurring headache I've ever had, but yet, it is so harmlessly mild compared to sickening misery of the typical CH syndrome, that I doubt that's what I have.
At least, I really really really really really hope that I don't.