Almost 4 months pp milk drop

I’m STRUGGLING! I am/was an over producer but tonight at my 9 pm pump I barely got an ounce combined and im sobbing! I return to work tomorrow and im terrified that my milk is drying up with the huge dip I just experienced. Trying to tell myself it’s just stress.. anyone experience similar? Also could use some encouragement for return to work… tips for pumping at work and maintaining a schedule/supply? How to get over the anxiety and stress of leaving my baby… I’m sending myself into panic attacks so anything helps…