S.T.
Call a nearby hospital / maternity ward and ask if you can use their breast pump - even if you end up having to throw out the milk - you'll keep your supply going. If that's not going to work go to a pharmacy and buy a new pump - even a battery powered one will be better than nothing. Good luck
Also make sure you're drinking alot of water of non-alcoholic fluids - you could be dehydrated which affects the amount your produce.