Alimentum to Neocate?

Hello ladies!

okay so i recently posted about my troubles bf but now thats out the window… i was on ted for about a week and saw no improvement and pretty much went 3 days not eating anything except a pear a day, needless to say it was just not healthy and wasnt seeing any improvement, tried probiotics but just got too impatient. so i made the decision to stop bf (still pumping just because im so hopeing i can go back she will just magically be able to eat it ) i went to the dr to test poop she said there was still a little blood in her poop which is same thing ive heard for 2 months but worried me because she was concerned she didnt gain any weight from 3 to 4 months which she said is a important growth spurt, she stayed 12lbs… so she gave me sample alimentum.. trial went bad for a day or 2 thought i made the worst mistake ever but got better which happens a lot even with new diets they go well i think i see the light at the end of the tunnel then my grunting diarreha baby comes back… so for my question she started it again except now is throwing up out of her nose which is scary.. so do i try neocate because i see alimentum has soy but so does neocate 6 percent? could it just be reflux and we need to try prevacid? i just am so lost these days she did so well and now shes in pain again and not sleeping well.. i saw rtf works better but its didnt she screamed worse which was confusing.. and also her poop smelss very iron like metal and only has a little mucus it just started a day or 2 ago when the grunting started again… also seems like shes teething but hates oragel and motrin didnt help the last 2 days am i missing something i just feel horrible having to let her cry to get something done cause she constantly wants my comfort