I had to make it clear to my co-workers that I was not to be disturbed. I was fortunate enough to have my own office, so I didn't have to hunt for a private place. I tried looking at pictures of my baby, listening to soft music, and anything else that would help me relax. I kept up pumping on the weekends in a similar manner, so I wouldn't feel so stressed during the week if I didn't pump as much as I thought I'd need. I don't know much about different breast pumps, but some may be more efficient than others.
Some women have the best success with hand-expression.
I also noticed that the amount of milk I could express decreased when my daughter started solid foods. Since I worked part-time, she eventually nursed only when I was home. While my daughter was being fed breast milk only, many suggested I switch to formula. I'll always be thankful that I resisted. Breastfeeding remained a wonderful way to nourish and nurture my baby.