Working pumping moms.

Hows it going? Lol. Has your supply dropped since going back to work despite pumping? On top of my supply taking sudden nose dive to less than half production. My girl suddenly has almost doubled her intake. I went from supplementing 1 bottle of formula a day to now the breastmilk being supplemental to formula. She even refused to feed from me this morning. I feel like throwing in the towel, but am continuing to put in a lot of effort for very little output. I guess it's still beneficial even if in small quantities, right?