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the trippy reflection of the light on the pool gave me vertigo and the nausea lasted a day or so then eventually cleared.
Meclizine did not help.
I won't be diving again until I've had proper training.
What would set my wife off was seeing a wreck that sat unevenly on the sea floor.
Before Meclizine, my wife used Dramamine, but the wreck sitting unevenly on the bottom still bothered her. Not knowing how early you took the Meclizine or how often prior to the dives, you might experiment with that. My wife takes it an hour before any activity with motion and as often as the instructions on the bottle allow, but only on the day of the activity. She doesn't get sick but still notices the slightest of motion - I often wonder if she took it the night before the activity if it would make a difference or not.
I had buoyancy issues the instructor had to put rocks in my pockets as I kept floating away.