Switching Formula.

Okay so my daughter is 1 month and 23 days. She's been on Similac Advanced, Similac Pro Senstive & Senstive. She wants nothing to do with Enfamil Premium Gentlease. After every feeding, her stomach is hard, she's super gassy(farting, hiccups) She throws up at almost feeding. It's hard for her poop. She also gets super fussy. I'm just curious on if I should switch her to soy. I'm going to call my doctor tomorrow to find out, but I just want to know if there's anything else I could before switching her to soy.