francodman,
i've never had it happen from an amusement park, but when i used to go boating for a whole weekend or for a week at a time, after being on a boat and sleeping on it and all for extended days, standing on dry land, u still feel like you're rocking, even though you're sitting/standing still.
it comes from your body adjusting to the rides to make yourself not sick on them through your equilibrium in your inner ear. the fluid in them shifts itself to compensate, and each person is different obviously, but how fast it does this depends, and how soon it goes back depends as well on the person. usually fast and hard trauma's don't do things like that, but the feeling u experience when u get off a ride like that of dizziness is attributed to the inner ear as well - haversian canals if i remember correctly from physiology. you should wake up in the morning feeling fine, having let your ears lie flat for a few hours should fix it all up.
hope this helps
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