Learnt this from movies that include speedsters but never fully understood why it’s like that. I only have a common sense that something bad will happen if you suddenly move too fast for a normal person to endure, but why specifically dizzy or nausea ?
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There’s an organ in your ears that helps keep track of your direction in space using a liquid and tiny hairs ‘feeling’ that liquid. This is combined with your other senses, primarily eyesight, to help you orient yourself.
If your senses disagree to what’s happening, that could mean you have been poisoned, so your body will make you nauseous as a defense.
Fast acceleration is perceived very differently by your eyes and inner ear, so that can trigger it. Likewise a swinging ship or a turning carousel can result in the same.
Additionally, high accelerations make you and your blood heavier during it, putting strain on your circulation and resulting in less oxygen reaching your brain, which also might make you dizzy like holding your breath for too long.
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