Get some rest!
Regardless of your situation, NICU babies, newborns or mother's of multiples, it's all exhausting. Take the time to put your feet up for 20 min, drink plenty of water, take your prenatal vitamins and get in the good nutrition that your body needs to keep up with these high demands. If you are not hungry, then add in healthy snacks, peanut butter crackers, protein bars, almonds, slim fast drinks or ensure drinks. These are not meant to take the place of meals but to give you extra nutrition when you just don't have much of an appetite. What happens if you don't, you will get run down, your milk supply will decrease, your feet and legs will swell and some mums, your blood pressure will go up. I have seen it all in the NICU, mums getting readmitted to try and get a better handle on BP meds and c-section incisions opening back up.
So, when someone tells you to "get some rest", what does that really mean? It means, put your feet up, lay down, take a nap if you can, read a book, watch TV or listen to music. While your mind is swirling with all the things that need to be done, you need to take the down time and let your body re-cooperate. The chores can wait, accept the help for the errands and the house hold chores. If you don't have the help, then space out your activities through out the day, it all does not have to be done at once. You have got to take care of you so you can take care of your baby/babies.