i need some help ladies. with my daughter she was very easy to feed. but with my little man it has…

i need some help ladies. with my daughter she was very easy to feed. but with my little man it has not been so easy, baby breastfeed in the middle of the night but has since been restless like he was still hungry. my nipple are sore so I decided I can do both only using formula when I needed a break. but every time he eats the formula he throws it all back up. Idk what to do because I'm in pain and he's probably hungry. what do u ladies think is going on? I'm waiting on his doctor to come see him but Idk what time she will be here.