Ginger...it's good for the stomach and it helps me. You can get a bag of candied ginger, or those luscious ginger chews from the health food store called Gin-Gins.
On one cruise, the cabin stewardess brought me saltines, which seemed to help. She said it was good to always have something on your stomach when seasick. I never thew up and these seemed to help.
On yet another cruise, some Norwegian officers on the ship said I should drink Aquavit. I did shoot one down (do not sip...shoot it down) and that helped as well.
Dramamine is also great.
Then, again, if it's this rough, nothing will help:
https://www.youtube.com/watch?v=jup-5Xu1OOU