We’re at a loss

Hello! My baby is 14 weeks now. I’ve never posted here before so I hope it’s the right place. Two weeks ago we switched from Similac Total Comfort to Alimentum because she was rejecting every bottle, crying, grunting, and turning away after weeks of eating fine. She’s on mostly formula and some breastfeeding during the day, so I also cut out dairy completely. She’s also on Pepcid twice a day and a probiotic.

Our Pediatrician recommended these things but also thought she might have just developed a preference for breastfeeding, but we didn’t want to do that as her only food source since I haven’t produced much since the beginning.

She has been sleeping through the night (around 10 pm-6am) since she was 7 weeks old. Now, the past few nights she’s been up every 45 minutes crying in her sleep, scrunching her body up, grunting. She’s fussy all day everyday. She has trouble passing gas, hardly poops. My baby is gone. We had trouble feeding and now we have trouble with everything.

I’m messaging my pediatrician again, but in the meantime, has anyone else has trouble like this? Isn’t hypoallergenic formula supposed to be the most sensitive for babies? I’m losing my mind and shes just getting worse since switching.