aptamil Pepti 1

My breast fed baby has become very unsettled & seems as though she is no longer satisfied after feeding. I pump constantly as well as breast feeding & my left breast seems to be drying up even though it's pumped & fed from every day. I have tried all different formulas so that I can supplement her with 1 or 2 bottles per day but she has severe reactions. Projectile vomit, green dioreah, rash on face & congested. The dr has today prescribed aptamil pepti 1 as suspects my little girl is cows milk intolerant (she also reacts to dairy in my diet, just not as severely). Has anyone tried this milk? If so any stories would be appreciated whether good or bad. I am still going to be breast feeding majority of feeds, just a supplement for when she needs a top up or I need a break!!