S.H.
See a Lactation Consultant, a professional who can address all of your concerns.
Main thing is that your baby is feeding on demand... no matter what that is, or how. They need proper intake daily and calorie intake etc.
Is he latching on fine? Getting enough intake? Does he now take a bottle fine?
With breast and bottle...some babies get nipple confusion, because the baby has to use 2 different "techniques" for sucking. So, maybe your son has to get used to nursing from breast. And even if he is, is he nursing properly? Can you hear him swallowing? How is your milk supply? Direct breast nursing is the best way to build up supply. But yes, as you said he will NOT nurse the rest of the day.
I really feel for you. It is a unique situation, considering all the you have gone through. So that is why, I feel a Lactation Consultant would be your best bet, for problem solving this. See what they suggest....
All the best, and take care,
Susan