Hello-
I’m glad to hear the medicine seems to be helping her pain. I definitely know how you feel about the spitting up. My son’s always been a big spitter. Unfortunately, if she does have a weak LES (that flap thing), then usually you just have to wait until she gets older & it develops & her system matures. There is a surgery that can be done in extreme cases.
The spitting up shouldn’t be a problem unless she isn’t gaining weight or if she is aspirating at all. There is a test to determine this.
Good luck at your appointment tomorrow. I hope you can find some answers.