Need to boost milk supply ASAP!!

I started this new job after being home with my baby for 5 months. My milk supply was fine until I started this job.

I don't have the time to pump as my breaks are short and I have nowhere to pump.

My son goes to daycare just down the road so I leave campus on lunch and feed him there.

The thing is, is that he use to eat every 2 or so hours and now my milk sits over night then again for 5 hours before he breastfeeds again. Then I wait another 6 hours before I'm home to feed him ..