No, I am fine when driving, but absolutely not in the back of the car. My travel sickness is also very variable. Some days I am fine on quite long journeys (as a front seat passenger), other days, the 15 minute park and ride journey leaves me feeling queasy. I have met others with this same problem.
Until last year we had a house in Normandy and we travelled from Portsmouth to Ouistrehem, a 6 hour ferry journey. We usually travelled during the day arriving in the evening, so if the weather forecast was poor I would take a tablet when i got on the ferry, and although I would still be dozy coming off the ferry, the nights sleep that followed fairly soon meant I woke in the morning with a fairly clear head.
Years ago, when I was expecting DD, I had bad morning sickness. the doctor prescribed antihistamines. Fortunately it was at the weekend, when DH was home because they knocked me out completely, and I was so sleepy, I was incapable of looking after my toddler son. I had to stop taking them, and endure the sickness.