Car Sick? Strange!

Today is day 12 post-op. I am feeling better than ever, except....when in the car, I find this strange because I never used to get car sick, especially while driving. It seems like everytime I am in the car I get nauseated. I thought it was a phase, or maybe the meds...but I have been off of meds for 7 days and still feel sick in the car. Has this happend to any one else? It usually hits as soon as I go over a bridge, but this morning on the way to work I didnt go over a "bridge" it was more like an overpass over the water. I noticed I was not feeling well prior to the "bridge" anyhow...This is strange and I guess maybe brought to the attention of my doctor, but I'm uncertain.