What formula to try next?

So my LO is 6 weeks tomorrow. We were breastfeeding but for reasons of our own we decided to switch her to formula. When I was breastfeeding her we were supplementing with Similac pro sensitive so when we made the full switch that’s what we kept her on. Within a week or two we noticed she was extremely gassy, fussy, and was having a very hard time with BMs..we were giving her gas drops with every bottle per her dr, burping every ounce and keeping her upright for 20-30 minutes after every bottle..nothing helped with the gas. When she started not sleeping at night and puking at every bottle we decided to switch formulas and went to Enfamil Gentlease..we noticed a huge difference in less than a day with the gas and fussing..she passes gas no problem now and no more gas drops..but the BM issues only seem to be getting worse..it’s seriously constipating her..is there another formula that has worked better for any of your LOs? I’m at a loss..I don’t know what else to try for her...