Help Bottle Feeding Mamas!

Alright so babygirl is 2 weeks & 2 days today she’s a preemie and we are bottle feeding. We have been using Dr Browns bottles since day one haven’t had an issue and she has been on Enfamil Neuropro Sensitive since birth. Recently she has started to forget she’s eating and choking herself with a mouth full of milk. And my mom said it was the nipples..so we switched to preemie nipples by Dr Brown & that isn’t working so we switched formula since she was fussing and crying with stomach aches from gas etc. She’s now on Enfamil Neuropro Gentlease anddd today she slept longer than usual ( typically she’s up every four hours to eat ) and she ate at 11a and slept most the day I tried waking her for her feeding at 3p and she was not having it and wouldn’t eat. I let her sleep and I bathed her and she finally ate an oz and a half at 7p

This is not like my baby 🥺 what do I do? I’m calling the doctor in the morning but has anyone else experienced similar things?! Usually if it’s a growth spurt they eat a lot but my baby is sleeping 😔 and I’m worried!