Help! Help! Help! Formula question!

I am new to this and feel lost and like I'm clueless. My baby is 7 weeks old and currently on the third kind of formula. We were on Enfamil newborn and she was spitting up and kinda fussy. The spit up was cottage cheese looking. We also tried Enfamil gentle when we first started formula and that gave her awful tummy aces. She is currently on Enfamil soy because her doc said she could have a bit of acid reflux but I think it is spitting up more she spit up half her bottle last night. Someone said try a different brand. Should I try Similac sensitive or someone told me that goodsomeone told me that Gerber Goodstart is really easy on tummies. Anyone have any experience similar to mine? Or have any suggestions? I feel so bad for my baby