It could be silent reflux. Mel's baby had that and as soon as it was sorted out she was an angel. I'm not sure what you need to do to have it checked out - maybe see your doc, I think there is a test for it. Also can anyone lend you a sling which will hold her upright - I'm thinking a mei tai or SSC, our resident slingaholics can probably give you an idea of the best option.

you're doing a great job