There is an article somewhere else on the boards about Ginger. It states that Ginger is a blood thinner. The article goes on to say that you should consult your doctor if you are taking any blood thining medication before taking Ginger. I did not know this, so I found it very interesting.
My Mom has Vertigo on land without cruising. She sometimes wakes up with the problem. She gets just as ill as someone with sea sickness. Her ENT doctor has her take meds. and in a few days she is ok again.