My wife and I had some disorientation after a 4 nighter to the Bahamas in which the weather was rough. Her disorientation lasted a week after the cruise and mine lasted 2-3 weeks. The disorientation made it feel like everything was moving for a brief moment. Check into Mal de Debarquement Syndrome. With the fluid swishing back and forth it takes a bit for your ears to readjust. Even if the boat is not encountering rough seas it does sway back and forth slightly which might throw off your equilibrium.
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