ftm mom kinda long plz help

Karen
My baby was born Sunday since delivering we did skin to skin she latched on quickly I was only breastfeeding at the hospital she was doing good she was pooping at least one a day and PeeIng 2-3times they did the Jaundice testing two times and came back fine then they said that I wasn't breast-feeding her enough I was breast-feeding her every 3 to 4 hours they tell me I'm supposed to breast-feed her every two I started doing that then they told me to give her formula because I wasn't giving her enough milk so they had me breast feeding her first then in a little bit of formula The Day before being released they tell me that her jaundice levels came back high so to strictly put her on formula so since that day and today my daughter has not pooped only Peed once I'm really getting worried it's very hard to feed her because they had her on Similac advance then they changed it to Similac sensitive because she was throwing up too much with the other milk I just feel like they have completely messed up her digestive system my daughter is tiny she's only 18 inches exactly 7 pounds when I was breast-feeding her every 3 to 4 hours she was peeing and pooping now I'm worried it's hard to feed her they want me giving her a full 2oz every 3hrs and she's hasn't pooped in two days only peed once I feel like her dr is a moron what should i do? Any advice to maybe help baby poop?