I also faint when I have a severe attack so you are definitely not alone. I know I'm not hyperventalating because I do that with needles and it definitely feels different.
My doctor says it's just my reaction to pain. She also told me that a lot of her IBS patients have a low-tolerance for pain and I'm one of them. When my body feels enough pain, it "shuts down" and causes me to faint. Not a good thing as I actually fainted while driving once. Came on so quick that I didn't even have time to panic.
Whenever I feel an attack coming on now, I pull over if I'm driving or make sure I sit down or lay down if I'm not on the toliet. Then there's a less of a distance to fall.
I know this might not be the answer you were looking for, but hopefully it helps!
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Re: Severe Attacks and Fainting
Came on so quick that I didn't even have time to panic.
