I saw some people already gave these suggestions, but I wanted to say them too because they worked so well for me.
Side postiton, with two rolled up towels on each side.
The miracle blanket (literally is a miracle
) my little one slept through the night the second night we put her in it. She was 7 weeks, and slept from 9 am to 6am. It scared me to death!
The crib wedge works great. It is only around 15 dollars and it helps. My daughter has a bit of reflux, so it makes me feel better.
Also, we put a fan in the room that makes a bit of white noise.
On the other hand, if none of this works, I think the carseat is probably fine, atleast for now.
I agree, that sometimes you just have to make it through, and worry about changing things later when they get older. A lot of things they just grow out of.