Typical indicators for seasickness are a dry mouth, cold sweat, dizziness and nausea, sometimes followed by vomiting.
Medically speaking seasickness is a variation of motion sickness or kinetosis. Though it does not always end up with the affected person "feeding the fishes," it can, however, ruin a boat trip. But with the right medicine and a few useful tips, it can be kept under control. There are a few things you can do to reduce the chance of feeling seasick. You should avoid alcohol and smoking at least a day before commencing your journey. On the day you set sail you should have slept enough and eaten small portions of food. The stomach should be neither totally empty nor totally full. It is also better to stay in mid-ship than at the bow or stern because that is where the sea swell is less pronounced. If you do feel unwell, the best thing to do is go to the upper deck, get some fresh air and fix your gaze at a point on the horizon. It's more likely you will feel ill below deck. Another good tip is to lie down in your bunk as sleeping lowers your levels of histamines. If you already know you are susceptible to seasickness or the sea will be rough, you should take some medication before beginning the voyage.
to end up：结果，造成
to set sail：起航，启程