Hey has anyone had problems with going back to ...

Hey has anyone had problems with going back to work while still breastfeeding? Its not my choice to go back, more of a financial situation. I will be able to feed my bubs in the morning and at night, but im worried about my boobs inflating and getting sore during the day. Its not really an option for me to express at work, i will be able to some days other days i travel to other towns. Plus i have to go away for a whole week to brisbane for work in Feb. I am not sure how i will cope with this??