Coldness and motion sickness during pregnancy?

Today my husband and I planned on taking a short trip to pick up something for his work. We left this morning and drive for about an hour there and another hour back. All together the trip was 2 1/2 hours max. I am prone to motion sickness and have been my entire life. Once we'd gotten home I was freezing. I kept on my jacket turned the heat up in our house and hid under my covers. I was still freezing. I was very hungery, yet had no energy to get up and feed myself. I was so tired. Eventually I drug myself into the tub to heat up. That kinda worked. I was still tired and nearly fell asleep in the tub had my husband not have come and got me out. I'm still cold and exhausted. Any correlation or explanation?