Cambia powder does not seem to do anything for CH, although it can help some people for migraine.

It was previously discussed on this forum:

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As discussed there, I'd look for someone who knows about CH, so a good headache specialist and not just a neuro. CHs are a complex area of medicine and it needs someone with a good understanding of the area to give the correct diagnosis and work out the appropriate treatment that will work for you. So from the knowledge shown by your current doctor you might be a lot better off looking for someone else and save yourself a whole lot of pain.

When your CH wears off please introduce yourself and tell us more about your CHs, what you take to prevent them and what you take when you get one to kill it off.

I can abort my CHs in around 5 minutes, often quicker with a combination of a high flow rate and a non-rebreather mask. I can't imagine how anything which relies on ingesting any substance will match that.

Given his apparent knowledge of CH and his ethics I'd look at another neurologist who really does specialise in CH.