Can you get a pump adapter for the car and pump on the long commute to and fro?
Also in terms of sleep it soumds like your baby is happy to tank up all night but that YOU are having an issue with that because he WAS sleeping for longer periods of time. The best thing you can do in terms of sleep, is let go of the idea that it is going to be any certain way for any length of time. It WILL continue to change every 4-6weeks the whole 1st year at least. I 2nd the idea that you let your baby eat as much and os often as you can while together. The only thing that will happen as a result of that is that your supply will increase due to increased feedings.