You're not going to chum - Think positive
Don't get seasick myself so I can't comment of the available drugs, patches,etc.
Have found with others on the boat that eating saltines if the stomach starts to go green helps.
As it is a little warm offshore right now- not knowing if the boat your going out on has AC or not- if you get overheated there's always the trick of soaking a towel in the ice/water in the drink box and using the towel to cool the forehead and neck with.
Hoping you have a great trip and catch some