Hi D. - I have three kids and I work full-time. I nursed all three. When I returned to work (after 12 weeks on maternity leave), I would pump twice a day until the baby was 6 months old. Usually, it was still not enough milk, so the babysitter supplemented. After 6 months, I would go to pumping once a day till the baby was about 9-10 months old. I had noticed that the milk supply would go up and down, but I still kept pumping. After the baby is 9-10 months, I would stop pumping at work at all.
In the evening, I would breasfeed right after work, then thoughout the evening on demand, and then throughout the night on demand (I co-sleeped also, and this is the only way I can get sleep). My body was still producing milk in the evening / night long after I stopped pumping. I breastfed my first baby till she was 15 months (she self-weaned), the second baby till about 22 months (I had to wean her as I was 7 months pregnant and didn't want to tandem-nurse in the future), and the third is 11 months now and still nursing. One thing I found is that my kids would nurse at night even when they got older (in other words, they won't sleep thru the night). I heard it somewhere that in the event when mom is away all day they learn to eat less during the day, and more at night, because they enjoy nursing much more then formula. I also had issues later on to teach the kids to sleep by themselves, but eventually they did.
If I were you I would still keep pumping, the fact that you don't get much milk might be temporary thing. I think the milk production depends on the person, so I would be afraid to stop pumping during the day so quickly for the fear of losing the milk supply. I know that pumping is a pain, but it doesn't last that long. But even if you decide to stop pumping now, it is possible that you still will be producing enough for evening/ nighttime feedings.
Good luck!
Katya.