I may be able to help, as I work with moms from all over the country and run the 100+ member Cape Cod Breastfeeding Moms Club.
Nipple pain can be used to diagnose HOW a baby is latching wrong. For instance:
Is it a sharp, toe curling pain the whole time, or just for the first few sucks, then calms down
Is it pain like a bruise being squeezed?
Are you cracked and are they mirror images of one another?
Are your nipples painful all the time or just when she nurses?
Does she latch, suck for a while, then break off and fuss, then relatch?
Check the following:
You get comfortable FIRST, then bring baby to where you are comfortable (don't lean down, hunch over, etc). Make sure that you are bringing the baby to your nipple where your nipple naturally falls (lift the breast to the baby is not good and your breast will eventually fall out to a bad position).
Make sure you are not holding the back of her skull. Your arm should be under her neck. SHe must be able to flec back her head to latch and nurse properly.
Make sure you can see her bottom lip and a bit of her tongue UNDER your areola when she is latched. Many babies roll in their bottom lip and WOW - can that hurt.
Make sure you break her suck with your finger between her gums - never just pull her off. If it hurts, break her off and start again. Remember, there is a learning curve for both of you.
Actually . . . I was going to list everything, but it will take decades to write. Any chance you can call me? ###-###-####. I am East Coast.
PS - I would NOT switch between breast and bottle this early or pump because the pump can impact your milk supply and the bottle can confuse the baby.
Also, Earth Mama Angel Baby nipple butter ROCKS for healing your nipples fast! All organic and safe for baby, use it religiously before and after you nurse for the first few weeks.