Re: how to cut the nursing to sleep connection?
I'm a little confused by your pediatrician's logic. Why does he think that weaning will help your child overcome the thrush? Milk residue doesn't usually just sit in the mouth of a breastfed baby. Breastfeeding isn't like bottle-feeding, which allows milk to drip-drip-drip into the child's mouth regardless of whether or not he's swallowing. A breastfeeding baby has to keep swallowing in order to get the milk to keep flowing.
If you decide you really do need to wean, then yeah, it's going to be a struggle! All you can do is refuse to nurse, keep the bedroom dark and quiet, and offer alternative forms of comfort (back rub, lullaby, etc.) until your LO falls asleep. It may help if someone other than you takes over the bedtime routine until your LO is completely weaned- because when he sees you, he's going to want to nurse.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"