Well, the test was inconclusive. Drat! I'm starting to think it's more than one thing. We have a Dr appointment today with Children's for her 4 month (corrected) check up. It is more of an occupational therapy thing, but I'm going to talk to them about her digestive issues too.
All the books say that happy-spitters (babies who spit up a lot but it's not a big deal) peak around 3 months and then improve. She was still getting worse after that, but then I figured that since she was a preemie, I should give her an extra month. Well, she's now 5 months old and she doesn't seem to be feeling very well. Poor kiddo! She's doing great in every other aspect, though! Hopefully we can get to the bottom of this. Prayers are appreciated.