Is it possible that she has reflux? The screaming might be the pain of the acid coming back up again, and I've heard (from my friend who's bub has reflux) that they then may want to feed more and more as the milk going down soothes the burning feeling.

Just a suggestion though... I don't really have any idea as we haven't experienced this. We just have nasty tummy pains long after a feed which result in great big noises at the other end!!! Might be worth getting it checked out however. My friend's bub ended up on reflux meds which she was reluctant to use at first, but now has a much happier, more relaxed baby - and thus, a happier more relaxed Mummy!

Good luck hun.