Baby with bad reflux?

any suggestions 4 a 2 month old who spits up badley we've switched her formula from goodstart=projectile vomiting, to soy=constipation+lots of spit up, to enfamil gentelease=spit up still. all the while adding cereal 4 thickness as the pediatrician recomended. but nothing seems to help. i have a pediatrician appt next week but just wondering if anyone had any ideas until then