Infant w/ rectal bleeding, vomiting and VERY fussy! ?

My son is 3 months old and has had rectal bleeding for over 2 months now and vomits a lot! His ped. referred him to a Ped. Gasternologist. The ped gastor. says he believes he is highly allergic to milk protiens. He had his formula switched a total of 6 times and is now on Neocate. As well as Beechnut cereal with every feeding, the Ped. Gastern. told me to stick 2 tsp in for every ounce, however I felt that was way to much cereal, for a 3 month old to be on. He is also on 3 acid reflux medications as well. The bleeding and vomiting subsided for about a week, but now it is all back again and now he is EXEREMLY fussy! I cant seem to do anything to calm him down. He falls asleep crying and wakes up crying! He has had a rough start at life, he was a NICU baby, need to be on a ventalor, cpap, nose cannale, feeding tube, had pnumonia 2x’s well in the nicu and had bronctics approx 2 wks ago. He had lung diease as well when he was born and was not able to keep his own oxygen level, they did blood gasses on him several times a day when he was in the nicu, he had yellow jaundice & had to have phototherapy as well when in the nicu. He also need a blood trasfusion when he was a week old, he had surgery for Pyloric stenonis when he was a month old. Nothing seems to be getting better for him. The doctors will try something new with him and the sythpoms subside for a week or two and are right back again. I dont know what else to do or what other doctors to have him checked by! No doctor has done blood work or any test on him. I am getting fed up with the docs. I hate seeing my baby in pain. And feel helpless when I cant do anything to make him better! I thought he may have Necrotizing Enterocolitis but I would have thought they would have tested him for that in the nicu. He has just about every sythpom of it except the budgling stomach. I mentioned it to the gastren. doc and he didnt want to hear anything about it! He is thinking it is the milk allergy as well as acid reflux, well if it is that why isnt the medication working and why is he still having all the samethings still going on! Why do they go away for a few days when they try something new for him then come back. I feel like they are using him as a guiene pig. I dont know where else to turn! PLease help me! And him!!!
i am going for a second opion but cant get in til feb. 2nd! I never heard of relacting, if its possible i try it! how do u go about doing it? I will do anything to make things better for my little guy. the doc said the cereal will make it thicker and hopefully will help it stay down
Tried Allimentuim and he had the same reaction as he is now when he was on it! I could try the milk thing at the hospital like you said. I was thinking maybe something to do with the blood transfusion, since I have no idea what or who it came from. The had to use a match and said they had to do it right away, and unfortnualy were at the hospital when it was found that he needed it, we were getting our other 2 children at a family members so we could get to the hospital with him, but the blood transfusion was done before we able to get there!