Gassy baby with reflux

Having a lot of trouble finding a formula to help my LO. I feel like we have been through all of them and she is only 6 weeks old. We started her out on similac pro advance but she was spitting up a good bit so they switched her to pro sensitive. She was gassy and still spitting up. Switched to gentlease and she was still gassy and would spit up a good bit but her poop was nice and regular. So we tried AR but her poops were crazy and she would choke on the formula a lot, then simililac isomil and she was pooping after every feeding and still very gassy but her spit up was ok. So we tried Enfamil prosobee and she got diarrhea and still gassy and just constant poops that her poor butt hole was just so irritated. So then we tried the Nutragimen well she would spit it up and didn’t want to drink it. So I went back to the gentlease. Well last night she projectile vomited after a feeding. Her tummy was swollen, I think with gas. After that she felt much better. I just don’t know what to do for her. What formula to even try next. We give gas drops and probiotics but they don’t seem to help too much. The nutrgimen is supposed to be so gentle that they don’t spit up or gas up but she was spitting up a good bit every feeding. She is on med for reflux as well. Help! Pls