Re: Pumping vs really painful nursing
Not pooping can mean nothing, or can be a sign of a baby not getting enough to eat. It never indicates that baby is getting too much to eat.
I agree with LLLMeg that a trip to a lactation consultant, preferably an IBCLC, is your best shot at getting this sorted out. I can totally understand why you don't want to nurse right now. However, I strongly suggest that you put the baby to the breast at least once or twice a day, more if you can stand it. It isn't generally recommended to introduce bottles so early, because babies often come to prefer the ease of bottle feeding and start rejecting the breast. If you can stand nursing just a one time per day, or better yet a few times a day, your baby is more likely to retain his latching skills and willingness to nurse. And nursing just a few times a day is unlikely to lead to severe nipple damage.
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!"