*Being told that you cannot express milk on your regular breaks. This may constitute discrimination, especially if there are other employees who are treated differently. Can others smoke a cigarette or run an errand during breaks? You should be allowed to express milk during your scheduled breaks, even if the process makes some of your co-workers uncomfortable.
*Having no place to express milk. Try looking realistically at where you could express milk at your particular workplace. Is there a room that isn't being used? Don't expect your company to find you a place. Find one yourself. Then try to convince your employer to let you use it. Unless you happen to work in Minnesota, employers are not required to accommodate you. However, if you offer a reasonable solution, presented with a persuasive smile, you should be able to convince your bosses.
*Not having enough time to express breastmilk. If this seems to be the case for you, begin by looking at whether you could speed up the process of expressing milk. Some breast pumps are not intended for daily use by a working mother. Are you using a double kit to express milk from both breasts simultaneously? If you are having difficulty, seek help from your local La Leche League. If, after all this, you still feel your employer is not providing you with enough time, look at other options, with the aim of accommodating your work needs and your nursing needs. Could you perhaps shorten your lunch break to make time for other breaks when you could pump? Could you come in early or leave late to make up for the missed time? Ask your boss what combination of break times would be most acceptable, making it clear that you do not necessarily want extra time off, just a better combination of breaks.