The symptoms you experience are extremely common.
Here's what the NHS website has to say about treatment:
http://www.nhs.uk/Con.../Pages/Treatment.aspx
You'll see that ginger is mentioned there as a possible way to deal with motion sickness. Just like you, I only need to look at a map, when travelling as a passenger in a car, to start feeling queasy. But I've been on a really horrendous cross-channel crossing armed, with a large bag of crystallised ginger, and not felt too bad. (By horrendous', I mean a crossing where the captain had initially refused to sail, where the crew were all being sick, where people were being thrown out of their seats and where two emergency calls for doctors were broadcast during the crossing - with one person dying from a heart attack and another suffering serious fractures).
Chris