Express some milk until your breasts are soft and comfortable. If you can't find that pump hand expressing in the shower might work. After you have emptied them as much as you can, put an icepack on them to reduce the inflamation and take a couple of neurofen (or panadol) Rest. You might want to wake your baby and feed a bit more often that usual. If, despite your best efforts you can't shift the engorgement and it becomes mastitis, it's no biggie - head to the dr for some-antibiotics in the morning. You will be better soon - no worse than a bout of flu and at least it's treatable