Enfamil Formula

Enfamil formula (Infant, Newborn, Gentlease) are all my son can keep down. Similac, Gerber, and store brands he throws up(projectile vomits them up). His pediatrician tried to tell me it was either acid reflux or a lactose intolerance. So she gave me some Enfamil Prosobee and Enfamil A.R both of which make him constipated. WIC had us try Enfamil Nutramigen, which he also throws up. He is only two months so its not like hes picking and choosing :/ are there anyother moms out there who found something that worked besides those three?