I've not read any other responses, so some of this might be a repeat. I am not going to go into the basics like drink water, get sleep...you know that!!
#1 is that you have to relax. I am a working and pumping mom, too, so I know how hard it is. It sounds silly, but try pumping while watching a video or looking at pictures of your daughter (better yet, have your man hold her beside you while you pump). I TALK and SING to my pictures at work and it works!! I can be 'dry' and after about 30 seconds of cooing, it starts flowing again. You may have to
You might try feeding on one side while pumping on the other.
You also might have unreal expectations. I had to pump a lot when my son was born b/c he was a preemie and tube fed. I was pumping 12-16oz a session at a time when he was eating 2-3oz. Once I started nursing him, it was a hard switch because that volume was my 'normal'. My breasts produced more than I needed and I was stressed as my supply dropped. I was much happier when i just let my supply drop to what was being demanded of me.
I realize no production from one side is a problem, but I have ALWAYS had a 'dud boob' as I affectionately refer to it. It produces half of the other one..sometimes less. It made me a little lop sided for a while, but now that my daughter is 10m, it is not a big deal.
Best of luck to you. I know you want to do it and as a mother of two (both breast fed while I worked full time) I know it is hard, but don't beat yourself up. Your daughter needs a mom who is happy and not crying and depressed as much if not more than she needs your milk vs formula. There are no medals in kindergarden given out ot bf kids!!! Right now, you are going through a transition (going back to work). Once you've had a couple more weeks, if it is still not working, you may want to evaluate your decision to continue.