i have never been sick on a freshwater dam or lake,
but ive been in the bay when there has been some pretty hairy swells , even dug the front half of ma boat in a swell once in the bay, and got airborne a few times, pretending i was a 747
i normally only get sick when im outside when there is a swell, when ur at the top and you can see land and then when u are in between them and cant see anything ing but water, but ive been 6 kays off shore and it was a flat as anything out there,
ive never taken any of those motion sickness tablets or patches, if there is a swell and im feeling a little sick, i stand up and i feel better,
i find standing up makes things a whole lot easier,