Thanks. Better, but still not so well, plus I'm afraid to go to sleep, because that's when it's most likely to happen.
I may have figured out how come I get the blurry vision, though, which is good. It could be due to temporarily low intraocular pressure, and actually, in that case, would be related to the symptoms that usually are mentioned in connection with cluster headache. (Most noticeably, a drooping eyelid, which I do get and currently have.)
I'd do art about all this, except that the sort of art you get from this business turns my stomach. I'm a squeamish fellow.