Formula help

I have a baby that has bad reflux (currently on Prevacid was on Zantac but it didn't work) and he throws up after every feeding, and he also has had pains and some constipation. He is on enfacare currently but I'd like to explore other options. Not looking to go full lactose free as he doesn't have blood in his stool which shows he doesn't have a milk allergy. But maybe he has a milk intolerance. I just need to know what people in the same situation have tried.