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Could you please elaborate on why you think you passed out or what led up to that incident? Whenever I'm particularly stressed, I tend to become very light-headed or dizzy to the point where it feels like I'm about to pass out, but I never do. I've had this on and off for years. I'm only 26 years old.

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Usually it is the way of breathing that changes, because of anxiety (fight or flight state). The pace and volume becomes imbalanced with respect to the oxygen / co2 needed, even when no hyperventilating seems to be happening. This imbalance causes lightheadedness and ultimately dizzyness or passing out. One trick that can help, when you feel like that, breathe in deeply and the breathe out very very slowly through a fine opening between the lips. Then pause several seconds and repeat. This can be done without anyone noticing, because it is subtle and slow.

I have the same thing, one weird connection I realized was: coffee. Apart from the stress of being a solopreneur, I noticed whenever I had coffee, I ended up being anxious/panicky later in the day.

It might be placebo, but since I stopped drinking coffee, I rarely have those intense feelings of anxiety.

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