When my son (#2) was born I nursed full time and he was colicky and miserable the whole time then I tried nursing and formula, taking out dairy in my diet while nursing, and then soy formula alone. Nothing worked. Finally, his pediatrician did a test on his stool which revealed he had blood in his stool. It also had some mucus. He said the blood and mucus clearly indicated a milk protein allergy. We switched him to Nutramigen and it worked great. He was 5 months at that point. I'm not sure, but I do think it does sometimes take a little while for the symptoms to clear up even though she is now on the Nutramigen. My oldest son (#1) had reflux even on Zantac and now takes Prilosec and it works great for the vomiting. My youngest son (#3)just got diagnosed with reflux in July and is now on Prevacid so I have dealt with vomiting, reflux, and several other Pediatric GI issues. If you need a really good GI doctor, we go to Dr. Jae-Koo An (Dr. Jack) at Dallas Medical City and he is also at Centennial Medical Center once a month in Frisco. We have also seen Annette Whitney and she is in the same practice with him. It is called Digestive Health Associates. Good luck and hang in there.