hi C.; being a new mom to what sounds like a colicky baby is really, REALLY hard; we are all here to support you. hang in there, it will get better.
i would like to suggest this to you; reconsider having baby sleep in bed with you; in other words, it might be a good idea! co-sleeping is very safe, healthy, and loving, as long as you know what you're doing. look at the Kellymom.com website, and the Dr. Jay Gordon website. please don't blindly accept common misconceptions about something that might really work for you!
if you decide that you really don't want the baby in the bed with you , consider putting him in a Mini Co-Sleeper on his side, propped up with pillows and swaddled. that's what i did with both my children. i kept my older one in bed with me the first 2 weeks and then moved him to the cosleeper swaddled and on his side, and my daughter went into the cosleeper after 3 weeks. with both of them i had it right next to my bed and i slept on my tummy with my arm stretched out over them, through the open side of the cosleeper. it was very soothing for both of us.
using the car to lull the baby is very understandable and i would say do it once in a while when things are impossible; sleep is probably the most important thing you need right now for your own wellbeing. but try other things first, because that's a lot of work for you, to get in and out of the car constantly, and it's not healthy in the long run. i still use the car once in a while for napping my kids when they are both totally fried and can't get into a nap; but not for night time.
i would also suggest trying out the book The No Cry Sleep Solution. and the time-tested Dr. Spocks' Baby and Childcare book for more ideas. also are you nursing? if so, contact your local La Leche League Intl. chapter for help; i nurse my children to sleep and it's never a problem. when they were mature enough (my son at 18 months, my daughter in the last couple weeks,) they became able to go to bed with thier dad alone.
good luck!
J.