Chronic Nausea for the past 5 years

Hi. I'm at my wit's end & have no idea what else I can do with this situation. I've always had motion sickness during long travels as a child, no biggie. But 5 years ago, all of a sudden, everything that moves made me nauseous. A 5 minute car ride or even using the computer or watching TV for more than a few hours makes me so sick I have to throw up to feel better. I went to a doc a couple of years ago who checked my ears but said I was fine. Everyday I have to take over-the-counter motion sickness / nausea pills to be able to function normally but I'm getting tired of this. Any info is greatly appreciated. Thanks.