Try helming more? Having your eyes fixed on the horizon helps keep your inner ears sorted, and it gives your mind something to do too.

If you're crewing, the traditional pose with legs over the rail will at least keep you looking out at the horizon. Also if you can sit yourself somewhere around the boat's centre of balance (a few feet aft of the mast) then you'll have less up-and-down. If you're just sat in the cockpit looking at the other side of the cockpit, things ain't too good.

And going below is a definite no-no!

Graham.