Four summers ago I fainted about 1/2 hour before landing after a hot vacation in FL. Doc said I was dehydrated. Took another few flights uneventfully. This summer I fainted about 1/2 hour after take off from Canada. Definitely adequately hydrated. Fainting feeling occurred while seated. Fainted once in the seat, and once standing up. Usual blood pressure is 110/60 or 70.
This has happened to me 4 or 5 times... you may have "vasovagal syncope" (situational fainting) and it's likely related to the low oxygen on the airplane... I usually get it after I've fallen asleep for a few minutes, on the way up (I've not gotten it on descent)-- you breathe more shallow when you sleep, so get even less oxygen (and it's low on airplanes to begin with).
I wake up feeling sick, get up, and pass out near the bathroom (never usually actually sick).
The last time, my husband was with me, and while I didn't stand up, he said I was out cold, with my eyes open.
Not sure what to do about it, but now that it's happened a few times for me, I think I'm going to pursue this with my doctor-- I've read about the monitor, and also tilt-table testing... I fly a lot, and I can't keep letting this happen (though if I don't sleep, it doesn't happen).
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