kate,
you sound so desperate! I don’t blame you. If you are worried about her belly, is there a children’s hospital near you? just take her to the ER. It sounds like you don’t trust your ped and it sounds like you need another opinion. I know you found a new ped, but that appoinment isn’t for another 2 weeks. your baby needs help now.
since your baby is on neocate and because you are worried about constipation and the suppositories are not helping then I would seek medical attention from somewhere else- the ER of a Children’s Hospital. You say you are in CT (from what I recall?). I bet there’s a children’s hospital not to far away. A visit might just give you some peace of mind.
as for the juice or the karo: it seems like her belly is in distress. I would go for mylanta cherry supreme. give 2mls and see what happens.
hang in there!
~laura