What causes migraines so bad that a person suddenly collapes with very little or no warning, often accompanied by profuse vomiting and aura? Mine are well controlled now, but no doctor has ever explained to me what all is behind this.
I have never gone unconscious with mine, but would just suddenly go down, fully aware of what was going on, but totally unable to get up during the worst of it. Yes, I had seen a headache specialist 75 miles away, but had to quit when my back pain (from the falls) prevented me from being physically able to go, and when I was even getting sick while on the drugs. My symptoms are well controlled now with a strictly organic diet, so that I very rarely get a migraine or vertigo. However, no one has ever explained the mechanism behind it. I was tested for oxygen level after an attack, and it showed normal. No one has ever tested me while an attack is actually going on, as the worst of it is so sudden, and the worst of it leaves just as suddenly, and then I am left with the residual effects.
If lack of oxygen is possibly behind this, like some answers suggest, then what causes the sudden lack of oxygen, and what causes the oxygen level to normalize when, after an attack, I am tested at the emergency room for oxygen levels and it is shown to be normal?

And, no neurologist ever explained any of this to me although I had seen several neurologists in several states.

Not even my headache specialist ever really answered this question although I saw her for more than a year.

Doctors just kept treating it like a "typical" migraine headache…you know, the kind with severe head pain, vomiting, sensitivity to light and sound, etc.

I am having to ask here because of not having any luck getting my questions answered anywhere else.
I’m not looking for the usual, general information about migraine headaches, their triggers, their causes, etc.

What I am talking about is very different from that.

I am looking at what causes a usual migraine headache to become a violent, life-threatening ordeal.

Thus far, none of the answers has explained this.

I have every reason to believe, after having studied this, that MSG is the culprit behind my most violent and potentially life-threatening symptoms. I’m not the only person to have collapsed from MSG, and the excitotoxin has been linked to numerous health problems.

It makes sense, given that when I stray at all off my organic diet I get sick again, as organic food does not tend to have added MSG in it, and conventional food tends to have it in high doses.
I was actually tested for whether my blood pressure drops when I suddenly stand, suddenly switch to sitting, lying down, etc., and even that test for me showed normal.

And, like I said, it seems a bit more than ironic that I don’t get these symptoms when I completely avoid MSG and artificial sweeteners.
Also, I am not talking about fainting when getting up too quickly or otherwise changing positions too quickly. I am talking about walking down the street and doing other everyday tasks, and suddenly collapsing, getting very dizzy, and vomiting.

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