DD hated the car. She would scream and scream. We had a little light-up toy that helped a little, but briefly. We turned her at six months and it got a little better but she just isn't one of these kids that's loves a car trip. I can count on one hand the amount of times she's slept in the car and she is two and a half. It got better when she could play the Wiggles on her iPad but at a few weeks old I don't know if that will help.
So.. No real advice, just sympathy **hugs**