Aside from nausea and vomiting, which could also be from seasickness, you might suffer fever, diarrhea and cramps.
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It may sound like the last thing you want to do, but keeping your stomach full by eating small meals and snacks throughout the day can help ward off nausea from seasickness. At the very least, regularly sipping ginger ale and eating crackers may do the trick for the first 24 hours.
Medications or illnessIf you have sinus congestion or a sinus or ear infection or have recently had a concussion, you may be more prone to motion sickness. People who get migraines are also more likely to get motion sickness.
Traveler's diarrhea occurs within 10 days of travel to an area with poor public hygiene. It's the most common illness in travelers. It's caused by drinking water or eating foods that have bacteria, viruses, or parasites. It usually goes away without treatment in a few days. Dehydration from diarrhea can be serious.
Other ways to prevent seasickness are to: be sure to have a little food in your stomach at all times (it's actually worse to have an empty stomach) get fresh air frequently. take some Dramamine or Meclizine right away when the captain calls for some rough seas – don't wait until you begin to feel sick.