OH my goodness, K. PLEASE DO NOT LISTEN TO THE DOCTOR ABOUT THIS HE IS VERY WRONG!
try going on line to find your local La Leche League International chapter, they are really the right people to be helping you with this. But for now, let me say this to you with love, as an older sister;
Nursing your daughter through a crisis is THE RIGHT THING TO DO. You are obviously a GREAT mom who is following her heart, and that's what you should keep doing! I wish i could hug you right now!
K., you and your daughter need this time of closeness and security, and you really need your sleep. Now is not the time to be enforcing difficult changes; both of you are already suffering and touching base by nursing in the night is what nature intended for the nursing relationship between a mother and child. It has very little to do with nutrition, it has to do with love, and you are providing love for your daughter and yourself in the most primal, foundational way humanly possibly. You are AMAZING.
Try to remember that doctors are about sickness; they will always come up with negative reasons why a natural and easy practice such as nursing in crisis or increased nursing for any reason will create a problem; you see, they have to stay in busines and they have to feel important. And while we love our doctors for the wonderful work they do when there is a sickness to address, they simply don't have appropriate answers for anything else.
Your child is not sick; but she may be suffering some heartbreak, as you are. Being there for her at a moment's notice, when she's lost half her world, it the most right thing you can do. Not only that, but think of all the other kinds of crises through which mothers have nursed children; i know of a mom who nursed her 5 month old son through cancer, and he thrived, went into total remission, walked at 10 months, spoke at a year, and is a champ. It waasn't all about the nutrition, K., is was about the connection.
Lastly, for now; the beauty of keeping up a constant nursing relationship during what you're experiencing is that if your child were to become sick, even with a cold, and had poor appetite, she would continue to nurse and have adequate nutrition and hydration. That has happened in my place several times. My son , 2.5, has had at least one stomach virus and one cold through which he didn't want to eat at all and he nursed fine, and he came through it fine, whereas if he hadn't nursed he would have dehydrated and things would have been much worse. My daughter, 10 months, is teething like crazy and wakes up 2-5 times per night, and goes back to sleep in 5 minutes of nursing because that's what helps.
Please make the most of this incredible gift that nature gave you as a mother.
if you want to discuss more you can send me a message on this site and we could email.
good luck,
J.